winamp/wa_ipc.h: replace UNREFERENCED_PARAMETER(item) with (void)(item)
winamp/wa_ipc.h: replace UNREFERENCED_PARAMETER(item) with (void)(item)

win32 sdk defines UNREFERENCED_PARAMETER(item) as (item) which generates
warnings with other compilers.

dbry/WavPack,dbry/WavPack,dbry/WavPack