mysql_thread_end memory leak in compat libmysqlclient.so.18

https://bugs.mysql.com/bug.php?id=66740 describes a memory leak in older versions of libmysqlclient (from MySQL). I have an app suffering from this leak on CentOS 7 with the mariadb-libs 5.5.60 package it ships. I noticed that the -compat packages from downloads.mariadb.org offer a dropin libmysqlclient.so.18, but to my surprise, those also have the leak!

libmariadb.so.3 from MariaDB-shared does not leak (when compiled against, it's not a drop in replacement apparently).

Would it be possible to backport the fix for that leak from libmariadb to compat/libmysqlclient?