Put halfpel_interpol under the same #ifdef as its usage, fixes the warning: snow.c:4142: warning: #halfpel_interpol# defined but not used
Put halfpel_interpol under the same #ifdef as its usage, fixes the warning:
snow.c:4142: warning: #halfpel_interpol# defined but not used


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@11035 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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