mariadb: new package

MariaDB is a drop-in replacement for MySQL. This commit adds a current
and stable version of MariaDB to the tree.

Quite a few ideas/patches were copied from Alpine Linux, Busybox Buildroot
and Debian.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

utils/mariadb/patches/100-fix_hostname.patch

@@ -0,0 +1,11 @@
+--- a/scripts/mysql_install_db.sh
++++ b/scripts/mysql_install_db.sh
+@@ -379,7 +379,7 @@ fi
+ 
+ 
+ # Try to determine the hostname
+-hostname=`@HOSTNAME@`
++hostname=`cat /proc/sys/kernel/hostname`
+ 
+ # Check if hostname is valid
+ if test "$cross_bootstrap" -eq 0 -a "$in_rpm" -eq 0 -a "$force" -eq 0