avcodec/huffyuv: Update outdated link

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/huffyuv.c

@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
  *
- * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
+ * see https://multimedia.cx/huffyuv.txt for a description of
  * the algorithm used
  *
  * This file is part of FFmpeg.

libavcodec/huffyuv.h

 /*
  * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
  *
- * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
+ * see https://multimedia.cx/huffyuv.txt for a description of
  * the algorithm used
  *
  * This file is part of FFmpeg.

libavcodec/huffyuvdec.c

@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
  *
- * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
+ * see https://multimedia.cx/huffyuv.txt for a description of
  * the algorithm used
  *
  * This file is part of FFmpeg.

libavcodec/huffyuvenc.c

 /*
  * Copyright (c) 2002-2014 Michael Niedermayer <michaelni@gmx.at>
  *
- * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
+ * see https://multimedia.cx/huffyuv.txt for a description of
  * the algorithm used
  *
  * This file is part of FFmpeg.