remove libmysqlclient-dev from req

Prod-related: PROD-26487 (PROD:26487)

Change-Id: I6710aa9b33bfaf544ec031193c05993a7e404060
diff --git a/galera/map.jinja b/galera/map.jinja
index 599669b..601ae26 100644
--- a/galera/map.jinja
+++ b/galera/map.jinja
@@ -114,7 +114,6 @@
     - galera-{{ galera_version }}
     - rsync
     - python-mysqldb
-    - libmysqlclient-dev
     - psmisc
     - netcat
     - percona-xtrabackup