MariaDB 10.3.11 missing the semisync plugin?

1. Install MariaDB 10.3.11 from the provided yum repository for CentOS 7
2. Go to documentation on semisync replication – https://mariadb.com/kb/en/library/semisynchronous-replication/
3. Try to install the plugin
MariaDB [(none)]> install plugin rpl_semi_sync_master soname 'semisync_master.so';
ERROR 1126 (HY000): Can't open shared library '/usr/lib64/mysql/plugin/semisync_master.so' (errno: 2, cannot open shared object file: No such file or directory)
4. Realise said plugin is not available so semisync cannot be used