fix: [mariadb] dump was broken due to ``shlib`` missing

We don't have ``shlib`` in docker image, and we don't need it
for this script. So the dependency was removed.

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

mariadb/resources/bin/mysql-backup

@@ -1,9 +1,5 @@
 #!/bin/bash
 
-. /etc/shlib
-
-include common
-include pretty
 
 usage="$exname [--host HOST] [DATABASE...]"
 
@@ -13,7 +9,7 @@ host=
 while [ "$1" ]; do
     case "$1" in
         "--help"|"-h")
-            print_usage
+            echo "$usage" >&2
             exit 0
         ;;
         "--host")