Win32: Fix collision over 'ControlMask'

Merged Jon Turney requested to merge jturney/xorgproto:w32api-collision-fix into master

Workaround the collision between ControlMask #defined in X11/X.h and ControlMask used as the name of a structure member in w32api/processthreadsapi.h in w32api 10.0.0

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