avformat/movenc: allow Apple Lossless inside mp4

The 'alac' identifier has been registered to ISO and thus towards
ISOBMFF at the MP4 registration authority. The existing non-MOV
mux mode matches the official ALAC-in-MP4 specification.

libavformat/movenc.c

@@ -7128,6 +7128,7 @@ static const AVCodecTag codec_mp4_tags[] = {
     { AV_CODEC_ID_VP9,             MKTAG('v', 'p', '0', '9') },
     { AV_CODEC_ID_AV1,             MKTAG('a', 'v', '0', '1') },
     { AV_CODEC_ID_AAC,             MKTAG('m', 'p', '4', 'a') },
+    { AV_CODEC_ID_ALAC,            MKTAG('a', 'l', 'a', 'c') },
     { AV_CODEC_ID_MP4ALS,          MKTAG('m', 'p', '4', 'a') },
     { AV_CODEC_ID_MP3,             MKTAG('m', 'p', '4', 'a') },
     { AV_CODEC_ID_MP2,             MKTAG('m', 'p', '4', 'a') },