mysql_get_client_version should return C/C version, not server version

The function mysql_get_client_info returns MARIADB_VERSION_ID which returns the server version instead of the actual connector version.
Since servers from 10.2 up to 10.6 always uses newest C/C version, it is impossible to detect client features depending on the version number.

Instead of mysql_get_client_info should return MARIADB_PACKAGE_VERSION_ID.