Change preprocessor check to _WIN32
Change preprocessor check to _WIN32

Change-Id: I841dc0b8ebb150ac998f4076c148d7bb187e4301

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futhan/libvpx,WebRTC-Labs/libvpx,luctrudeau/aom,ShiftMediaProject/libvpx,shareefalis/libvpx,cinema6/libvpx,VTCSecureLLC/libvpx,liqianggao/libvpx,awatry/libvpx.opencl,sanyaade-teachings/libvpx,shacklettbp/aom,charup/https---github.com-webmproject-libvpx-,running770/libvpx,jmvalin/aom,Maria1099/webm.libvpx,Suvarna1488/webm.libvpx,lyx2014/libvpx_c,mbebenita/aom,rikaunite/gst-opera_libvpx,webmproject/libvpx,vasilvv/esvp8,altogother/webm.libvpx,mwgoldsmith/vpx,Distrotech/libvpx,turbulenz/libvpx,jmvalin/aom,mrchapp/libvpx,goodleixiao/vpx,enmasse-entertainment/libvpx,liqianggao/libvpx,jdm/libvpx,openpeer/libvpx_new,pcwalton/libvpx,abwiz0086/webm.libvpx,jacklicn/webm.libvpx,stewnorriss/libvpx,Distrotech/libvpx,jacklicn/webm.libvpx,luctrudeau/aom,Laknot/libvpx,stewnorriss/libvpx,turbulenz/libvpx,altogother/webm.libvpx,charup/https---github.com-webmproject-libvpx-,smarter/aom,matanbs/webm.libvpx,Distrotech/libvpx,rikaunite/gst-opera_libvpx,VTCSecureLLC/libvpx,Laknot/libvpx,shareefalis/libvpx,Distrotech/libvpx,kim42083/webm.libvpx,thdav/aom,matanbs/vp982,cinema6/libvpx,altogother/webm.libvpx,rikaunite/gst-opera_libvpx,running770/libvpx,turbulenz/libvpx,Maria1099/webm.libvpx,Suvarna1488/webm.libvpx,mbebenita/aom,goodleixiao/vpx,shyamalschandra/libvpx,matanbs/vp982,mwgoldsmith/vpx,felipebetancur/libvpx,GrokImageCompression/aom,kalli123/webm.libvpx,kim42083/webm.libvpx,GrokImageCompression/aom,genesi/libvpx0,abwiz0086/webm.libvpx,jacklicn/webm.libvpx