lavf: Make codec_tag arrays constant

Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/cafdec.c

@@ -394,5 +394,5 @@ AVInputFormat ff_caf_demuxer = {
     .read_header    = read_header,
     .read_packet    = read_packet,
     .read_seek      = read_seek,
-    .codec_tag      = (const AVCodecTag*[]){ ff_codec_caf_tags, 0 },
+    .codec_tag      = (const AVCodecTag* const []){ ff_codec_caf_tags, 0 },
 };

libavformat/ivfdec.c

@@ -87,5 +87,5 @@ AVInputFormat ff_ivf_demuxer = {
     .read_header    = read_header,
     .read_packet    = read_packet,
     .flags          = AVFMT_GENERIC_INDEX,
-    .codec_tag      = (const AVCodecTag*[]){ ff_codec_bmp_tags, 0 },
+    .codec_tag      = (const AVCodecTag* const []){ ff_codec_bmp_tags, 0 },
 };