mariadb: update to 5.5.46

This is the latest release in the 5.5.x stable series.
It fixes 11 CVEs as listed:
   https://mariadb.com/kb/en/mariadb/mariadb-5546-release-notes/


and fixes 10s of internal MariaDB tracked defects.

Signed-off-by: Randy MacLeod <Randy.MacLeod@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>