Remove duplicated MUL16 macro definition, fixes the warning: libavcodec/ac3enc.c:119:1: warning: "MUL16" redefined
Remove duplicated MUL16 macro definition, fixes the warning:
libavcodec/ac3enc.c:119:1: warning: "MUL16" redefined


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@17832 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg