The data base lenth passed to invalidator fixed

* skip debian 44_scripts__mysql_config__libs.dpatch it does not apply anymore
  (and anyway it would not work for a static library)
* fix the path for install(mariadb.pc)

MDEV-5553 A view or procedure with a non existing definer can block "SHOW TABLE STATUS" with an unclear error message

Don't double-check privileges for a column in the GROUP BY that refers to
the same column in SELECT clause. Privileges were already checked for SELECT clause.

skip NULL VARCHAR key parts like it's done elsewhere

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