DecoderControl, InputStream: use Mutex/Cond instead of GMutex/GCond

src/archive/ZzipArchivePlugin.cxx

@@ -143,7 +143,7 @@ struct zzip_input_stream {
 static struct input_stream *
 zzip_archive_open_stream(struct archive_file *file,
 			 const char *pathname,
-			 GMutex *mutex, GCond *cond,
+			 Mutex &mutex, Cond &cond,
 			 GError **error_r)
 {
 	struct zzip_archive *context = (struct zzip_archive *) file;