Fix for deprecation of DECLARE_ALIGNED

[cqhanson]

Avutil deprecated DECLARE_ALIGNED. To successfully build you can make the the following changes. This works on Mac Ventura 13.5.2, 2018 Mac mini i7.

In comskip.c, edit following lines:

737 static long histogram[256];
738 static long lastHistogram[256];
...
10100 static int own_histogram[OWN_HISTOGRAM_WIDTH][OWN_HISTOGRAM_HEIGHT];

In mpeg2dec.c, edit following line:

352 static short audio_buffer[AUDIOBUFFER];