fix _WIN32 check to exclude Symbian emulator builds
fix _WIN32 check to exclude Symbian emulator builds

svn path=/trunk/vorbis/; revision=7543

ShiftMediaProject/vorbis,nicolaichuk/vorbis,erikd/vorbis,mwgoldsmith/vorbis,nicolaichuk/vorbis,felipebetancur/vorbis,ShiftMediaProject/vorbis,mwgoldsmith/vorbis,emscripten-ports/Vorbis,eidy/vorbis,mwgoldsmith/vorbis,emscripten-ports/Vorbis,emscripten-ports/Vorbis,ksophocleous/vorbis,ksophocleous/vorbis,felipebetancur/vorbis,felipebetancur/vorbis,ShiftMediaProject/vorbis,erikd/vorbis,youfearm3/vorbis,nicolaichuk/vorbis,eidy/vorbis,eidy/vorbis,eidy/vorbis,felipebetancur/vorbis,erikd/vorbis,mwgoldsmith/vorbis,ksophocleous/vorbis,erikd/vorbis,youfearm3/vorbis,ksophocleous/vorbis,emscripten-ports/Vorbis,youfearm3/vorbis,nicolaichuk/vorbis,youfearm3/vorbis,ShiftMediaProject/vorbis,ShiftMediaProject/vorbis,ShiftMediaProject/vorbis