Free ZTS lock in opcache

For some reason this only shows up as a leak when using phpdbg.

Author: nikic

ext/opcache/zend_shared_alloc.c

@@ -285,6 +285,10 @@ void zend_shared_alloc_shutdown(void)
 	g_shared_alloc_handler = NULL;
 #ifndef ZEND_WIN32
 	close(lock_file);
+
+# ifdef ZTS
+	tsrm_mutex_free(zts_lock);
+# endif
 #endif
 }