client/windows: remove precompiled header for common.h (fix broken windows debug build)
client/windows: remove precompiled header for common.h (fix broken windows debug build)

-Release currently doesn't use precompiled headers at all
-Debug is broken since common/*.c files don't include common.h
-PCH can be enabled for all but specifically-chosen c-files

dezelin/spice,Fantu/spice,alon/spice-server,dezelin/spice,fgouget/spice,ya-mouse/spice,mathslinux/spice,alon/spice-server,elmarco/spice,ya-mouse/spice,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,elmarco/spice,ya-mouse/spice,fgouget/spice,SPICE/spice,mathslinux/spice,mathslinux/spice,alon/spice-server,dezelin/spice,SPICE/spice,fgouget/spice,freedesktop-unofficial-mirror/spice__spice,elmarco/spice,SPICE/spice,freedesktop-unofficial-mirror/spice__spice,Fantu/spice,Fantu/spice,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,dezelin/spice,fgouget/spice,alon/spice-server,Fantu/spice,alon/spice-server,elmarco/spice,freedesktop-unofficial-mirror/spice__spice,elmarco/spice,dezelin/spice