backport the new fix from 10.0

1. move cflags/libs cleanup from mysql_config.sh (runtime)
   to for_client.cmake (build time). Include/library paths are
   still calculated at runtime (they depend on the location of mysql_config)

2. Use cleaned-up cflags/libs to generate mariadb.pc

3. remove obsolete @expansions@ from mysql_config (for variables that are
   never set in cmake files)

add bsdutils dependency, because mariadb-server-5.5 deb package uses logger

apply debian's patch to workaround kfreebsd bug

and apply whatever was reasonable

typo (thanks, Brad Smith!)

stat structure (from <sys/stat.h>) is conditionally defined
to have different layout and size depending on the defined macros.
The correct macro is defined in my_config.h, which means it MUST be
included first (or, at least before <features.h> - so, practically,
before including any system headers).

            SET @@global.log_output

Deadlock chain:
rdlock(LOCK_logger) -> lock(LOCK_open)     SELECT 1
lock(LOCK_open)     -> lock(LOCK_status)   DROP TABLE t1
lock(LOCK_status)   -> lock(LOCK_g_s_v)    SHOW STATUS
lock(LOCK_g_s_)     -> wrlock(LOCK_logger) SET @@global.log_output=DEFAULT

Fixed by removing relationship between LOCK_status and
LOCK_global_system_variables during SHOW STATUS: we don't really need
LOCK_global_system_variables when accessing status vars.

            SET slow_query_log and failed connection attempt

A very subtle though valid deadlock. Deadlock chain:
wrlock(LOCK_grant)    -> lock(acl_cache->lock) GRANT/REVOKE CREATE/DROP USER
lock(LOCK_open)       -> rdlock(LOCK_grant)    SELECT * FROM I_S.COLUMNS
wrlock(LOCK_logger)   -> lock(LOCK_open)       SET @@global.slow_query_log='ON'
lock(acl_cache->lock) -> rdlock(LOCK_logger)   Failed connection

Fixed by removing relationship between acl_cache->lock and LOCK_logger
during failed connection attempt.

mysql-test/r/func_group.result:
  Test case
mysql-test/t/func_group.test:
  Test case
sql/item_sum.cc:
  Restore ORDER for prepared statements

and other fixes for gcc-4.9.1 on sid

don't install them at all

don't send an OK packet if the SHOW PROCESSLIST was killed

* remove bundled jemalloc, use the system one
* force jemalloc in release builds on linux

bits were inconsistent though the handle was opened without those bits
set. This caused dbremove to always fail.

Avoided exponential recursive calls of JOIN_CACHE::join_records() in the case
of non-nested outer joins.
A different solution is required to resolve this performance problem for
nested outer joins.

fix readline/libedit detection:
* search in readline/, editline/ and edit/readline/
* fix typos CMAKE_REQUIRES_LIBRARIES -> CMAKE_REQUIRED_LIBRARIES
* use correct libedit API
* use different cmake variables for libedit and readline

FT-591 fix valgrind uninitialized value error in block allocator test caused by reading past the end of a the blockpair array