[packages] mariadb: update to mariadb 5.5.36

- use system jemalloc

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>
[packages] add new package jemalloc

jemalloc is required by mariadb

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>