define spice_mb MemoryBarrier for WIN64
define spice_mb MemoryBarrier for WIN64

__asm is not supported on _WIN64, so use macro instead
required for Windows x64 guest display driver (qxldd.dll)

vdiot/spice-protocol,Fantu/spice-protocol,dezelin/spice-protocol,elmarco/spice-protocol,SPICE/spice-protocol,freedesktop-unofficial-mirror/spice__spice-protocol,Fantu/spice-protocol,elmarco/spice-protocol,SPICE/spice-protocol,fgouget/spice-protocol,dezelin/spice-protocol,elmarco/spice-protocol,SPICE/spice-protocol,fgouget/spice-protocol,fgouget/spice-protocol,dezelin/spice-protocol,vdiot/spice-protocol,freedesktop-unofficial-mirror/spice__spice-protocol,vdiot/spice-protocol