Was finally removed in >=mysql-8.0.2

--- a/dbd/apr_dbd_mysql.c
+++ b/dbd/apr_dbd_mysql.c
@@ -1262,9 +1262,6 @@ static apr_status_t thread_end(void *data)
 
 static void dbd_mysql_init(apr_pool_t *pool)
 {
-#if MYSQL_VERSION_ID < 100000
-    my_init();
-#endif
     mysql_thread_init();
 
     /* FIXME: this is a guess; find out what it really does */