avfilter/vf_deblock: add timeline support

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/vf_deblock.c

@@ -410,4 +410,5 @@ AVFilter ff_vf_deblock = {
     .query_formats = query_formats,
     .inputs        = inputs,
     .outputs       = outputs,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
 };