MDEV-10943 . Workaround linker error on Linux. Linux does not actually use __bss_start,  put __bss_start into #ifndef __linux__ section

Part 3 (final): removing MY_CHARSET_HANDLER::well_formed_len().

The result of binlog_{row|stm}_ctype_ucs.test depended on the machine
time zone setting. Making the test timzone independent.

MDEV-10867 PREPARE..EXECUTE is not consistent about non-ASCII characters

Previously Travis-CI stated that cracklib is forbidden, but it does
not longer seem to be the case.

Now we check if a dependency is available and not just if older versions
are available. Also use correct name of libcrack2 to actually detect it.

Use sed to inject dependency at the end of the dependency list.
Otherwise keep the control line clean and parseable by Debian tools.

- All build-depends should be in one place.
- Library packages should depend on their main package using strict version.
- Most packages should depend on the misc variable, so that debhelper
  can fill in it with various calculated dependencies automatically.
- All packages using dynamic libraries should depend on the shlibs variable
  to include shared libraries as dependencies automatically.
- Essential tools like bsdutils, grep and tar shall not be defined in vain.

bash char substitution is not supported for other file options (e.g. read default file)

- Fixed compiler warnings
- Removed have_debug.inc from innochecksum_3
- Fixed race condition in innodb_buffer_pool_load
- Fixed merge issue in innodb-bad-key-change.test
- Fixed missing array allocation that could cause
  function_defaults_notembedded to fail
- Fixed thread_cache_size_func

Fixed a few failing tests

This fixed several cases where we where using just ulong for sql_mode

This is similar to MysQL Worklog 3253, but with
a different implementation. The disk format and
SQL syntax is identical with MySQL 5.7.

Fetures supported:
- "Any" ammount of any trigger
- Supports FOLLOWS and PRECEDES to be
  able to put triggers in a certain execution order.

Implementation details:
- Class Trigger added to hold information about a trigger.
  Before this trigger information was stored in a set of lists in
  Table_triggers_list and in Table_triggers_list::bodies
- Each Trigger has a next field that poinst to the next Trigger with the
  same action and time.
- When accessing a trigger, we now always access all linked triggers
- The list are now only used to load and save trigger files.
- MySQL trigger test case (trigger_wl3253) added and we execute these
  identically.
- Even more gracefully handling of wrong trigger files than before. This
  is useful if a trigger file uses functions or syntax not provided by
  the server.
- Each trigger now has a "Created" field that shows when the trigger was
  created, with 2 decimals.

Other comments:
- Many of the changes in test files was done because of the new "Created"
  field in the trigger file. This shows up in SHOW ... TRIGGER and when
  using information_schema.trigger.
- Don't check if all memory is released if on uses --gdb;  This is needed
  to be able to get a list from safemalloc of not freed memory while
  debugging.
- Added option to trim_whitespace() to know how many prefix characters
  was skipped.
- Changed a few ulonglong sql_mode to sql_mode_t, to find some wrong usage
  of sql_mode.

Signed-off-by: Daniel Black <daniel.black@au.ibm.com>

index creation for SPATIAL indexes.

The bug was caused by a misplaced construct opt_with_clause
for one of the variants of CREATE ... SELECT.

The code for st_select_lex::find_table_def_in_with_clauses()
did not take into account the fact that the specs for mergeable
CTEs were cloned and were not processed by the function
With_element::check_dependencies_in_spec().

There was no implementation of the virtual method print()
for the Item_window_func class. As a result for a view
containing window function an invalid view definition could
be written in the frm file. When a query that refers to
this view was executed a syntax error was reported.

MDEV-10908: innodb_zip.bug56680 fails in buildbot with InnoDB: Failing assertion: bpage->id.space() == page_id.space()

Incorrect merge introduced too strict assertion.

MDEV-10918 Innodb/Linux - Fallback to simulated aio if io_setup() fails, e.g due to insufficient resources

The bug was in the code of the recursive method
With_element::check_unrestricted_recursive. For recursive
calls of this method sel->get_with_element()->owner != owner.