Do not include mathematics.h in avutil.h

ffmpeg.c

ffplay.c

ffserver.c

libavcodec/acelp_pitch_delay.c

libavcodec/ituh263dec.c

libavcodec/mpegvideo_enc.c

libavcodec/snow.c

libavcodec/utils.c

libavcodec/xsubdec.c

libavfilter/vf_aspect.c

libavfilter/vf_crop.c

libavfilter/vf_overlay.c

libavfilter/vf_pad.c

libavfilter/vf_scale.c

libavfilter/vf_setpts.c

libavfilter/vf_settb.c

libavfilter/vsrc_color.c

libavfilter/vsrc_nullsrc.c

libavformat/applehttp.c

libavformat/asfdec.c