Matching libmariadb-dev package contents in official Debian repositories,
the MariaDB Connector/C files should go into a folder using the 'mariadb'
name. For compatibility with sources that expect to find 'mysql' stuff,
create a symlink from include/mysql to include/mariadb.

Using this package any source that expects MySQL Client libraries should
build without changes. Sources that expect MariaDB Connector C should
build using only libmariadb-dev.

Current MariaDB Connector/C does not build quite identically in
this source tree compared to how it build in Debian official.
The remaining differences are tracked in MDEV-14921.

No path is required. These files always reside in the same directory
anyway.

We already ship libmysqlclient18 that replaces any existing package
with the same name and install symlinks that point to out libmariadb.so.

Instead of creating more packages, we add just one more that does the
same and provides both libmysqlclient19 and -20 replacements symlinks.

This is a clean solution, because systems that only use (and are built
against) libmariadb will not need them and if somebody has done a mistake
in the linker parameters, they will spot it and can easily update the
filename to libmariadb.

- tokuft_logprint should be shipped in the TokuDB plugin
- mysql_install_db is needed for installing/upgrading the datadir
  so it must be in the server core package so users can roll their
  own upgrades

There is no point in having version suffixes in plugin packages. They
will via their control file anyway depend on the correct server or client
version. Having version suffices has no benefit and it just complicates
upgrades when a new major version name package needs to replace all
possible previous version.

This issue was overlooked when merging commit
844a5759 from 10.2 into 10.3, so it
needs to be manually fixed now.

The correct format for new Debian packages is to define install lists
as *.install files. This has already been fixed for 10.3, but it when
merging commit c5a525bd from 10.2, this
change was overlooked and a file of the old format slipped in.

The libmariadb-dev package must include this directory so that downstream
developers can intentionally include MariaDB libraries as they want.

This matches the contents of the official Debian libmariadb-dev package.

TokuDB and Mroonga are not built on Travis CI to save time. Previously
their packages were not created due to a hack in debian/rules, that got
removed in commit 9631d933. This change complements that commit.

btr_cur_search_to_nth_level(), btr_search_guess_on_hash(),
btr_pcur_open_with_no_init_func(), row_sel_open_pcur():
Replace the parameter has_search_latch with the ahi_latch
(passed as NULL if the caller does not hold the latch).

btr_search_update_hash_node_on_insert(),
btr_search_update_hash_on_insert(),
btr_search_build_page_hash_index(): Add the parameter ahi_latch.

btr_search_x_lock(), btr_search_x_unlock(),
btr_search_s_lock(), btr_search_s_unlock(): Remove.

btr_cur_search_to_nth_level(), row_sel(): Do not bother to yield to
waiting exclusive lock requests on the adaptive hash index latch.
When the btr_search_latch was split into an array of latches
in MySQL 5.7.8 as part of the Oracle Bug#20985298 fix, the "caching"
of the latch across storage engine API calls was removed. Thus,
X-lock requests should have a good chance of becoming served, and
starvation should not be possible.

btr_search_guess_on_hash(): Clean up a debug assertion.

Also, use 32-bit native reads to read the 32-bit aligned
FIL_PAGE_PREV and FIL_PAGE_NEXT reads, to compare them to the
byte order agnostic pattern FIL_NULL (0xffffffff).

This is mere code clean-up; the reported problem was already fixed
in commit 3fdd3907.

row_sel(): Remove the variable search_latch_locked.

row_sel_try_search_shortcut(): Remove the parameter
search_latch_locked, which was always passed as nonzero.

row_sel_try_search_shortcut(), row_sel_try_search_shortcut_for_mysql():
Do not expect the caller to acquire the AHI latch. Instead,
acquire and release it inside this function.

row_search_mvcc(): Remove a bogus condition on mysql_n_tables_locked.
When the btr_search_latch was split into an array of latches
in MySQL 5.7.8 as part of the Oracle Bug#20985298 fix, the "caching"
of the latch across storage engine API calls was removed, and
thus it is unnecessary to avoid adaptive hash index searches
during INSERT...SELECT.

This is not fixing the reported problem, but a potential problem that was
introduced in MDEV-11369.

row_sel_try_search_shortcut(), row_sel_try_search_shortcut_for_mysql():
When an adaptive hash index search lands on top of rec_is_default_row(),
we must skip the candidate and perform a normal search. This is because
the adaptive hash index latch only protects the record from being deleted
but does not prevent concurrent inserts into the page. Therefore, it is not
safe to dereference the next-record pointer.

This race condition is a regression caused by MDEV-12121.

btr_cur_update_in_place(): Determine block->index!=NULL only once
in order to determine whether an adaptive hash index bucket needs
to be exclusively locked and unlocked.

If we evaluated block->index multiple times, and the adaptive hash
index was disabled before we locked the adaptive hash index, then
we would never release the adaptive hash index bucket latch, which
would eventually lead to InnoDB hanging.

innodb.truncate_inject: Replacement for innodb_zip.wl6501_error_1

Note: unlike MySQL, in some cases TRUNCATE does not return
an error in MariaDB. This should be fixed in the scope of
MDEV-13564 or similar.

MariaDB inherits the MySQL limitation that ALGORITHM=INPLACE cannot
create more than one FULLTEXT INDEX at a time. As part of the MDEV-11369
Instant ADD COLUMN refactoring, MariaDB 10.3.2 accidentally stopped
enforcing the restriction.

Actually, it is a bug in MySQL 5.6 and MariaDB 10.0 that an ALTER TABLE
statement with multiple ADD FULLTEXT INDEX but without explicit
ALGORITHM=INPLACE would return in an error message, rather than
executing the operation with ALGORITHM=COPY.

ha_innobase::check_if_supported_inplace_alter(): Enforce the restriction
on multiple FULLTEXT INDEX.

prepare_inplace_alter_table_dict(): Replace some code with debug
assertions. A "goto error_handled" at this point would result in
another error, because the reference count of ctx->new_table would be 0.

Speed up compilation

Standard C++ headers contribute a lot to compilation time. Avoid algorithm
and sstream in frequently used headers.

commit 3dc3ab1a introduced
Rows_event_tracker, using a mismatch of size_t (the native
register width) and my_off_t (the file offset width, usually
64 bits). Use my_off_t both in member fields and member functions.

This is a regression that was introduced in MySQL 5.7.6 in
https://github.com/mysql/mysql-server/commit/19855664de0245ff24e0753dc82723fc4e2fb7a5

fil_node_open_file(): Use proper 64-bit arithmetics for truncating
size_bytes to a multiple of a file extent size.

- Removed extra set -x -v used for debugging
- Fixed that that gcc version tests works for gcc 7

Server already has HMT_low/HMT_medium.