Merged release 0.15.3 from branch 'v0.15.x'

Conflicts:

	NEWS
	configure.ac

src/decoder/vorbis_plugin.c

@@ -382,7 +382,7 @@ vorbis_tag_dup(const char *file)
 		return NULL;
 	}
 
-	if (ov_open(fp, &vf, NULL, 0) < 0) {
+	if (ov_test_callbacks(fp, &vf, NULL, 0, OV_CALLBACKS_STREAMONLY) < 0) {
 		fclose(fp);
 		return NULL;
 	}