Fix for MDEV-13317: PHP5 crashes
Fix for MDEV-13317: PHP5 crashes

Added check if callback functions for crypto locking were already registered.

ottok/mariadb-connector-c,MariaDB/mariadb-connector-c,MariaDB/mariadb-connector-c,ottok/mariadb-connector-c,ottok/mariadb-connector-c,MariaDB/mariadb-connector-c