Replace many includes of libavutil/common.h with what is actually needed

This reduces the number of false dependencies on header files and
speeds up compilation.

Originally committed as revision 22407 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/crc.c

@@ -19,6 +19,7 @@
  */
 
 #include "config.h"
+#include "common.h"
 #include "bswap.h"
 #include "crc.h"