X Server helper

Code from X11's region.h, Region.c, poly.h, and PolyReg.c

Used in Qt GUI (QRegion).

The sources can be found in reproducible-path/qtbase-opensource-src-5.15.8+dfsg/src/gui/painting/qregion.cpp.

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 Copyright (c) 1987, 1988 X Consortium
 Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

X11 License and Historical Permission Notice and Disclaimer.

 Copyright (c) 1987, 1988  X Consortium

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 used in advertising or otherwise to promote the sale, use or other dealings
 in this Software without prior written authorization from the X Consortium.


 Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.

                         All Rights Reserved

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 documentation for any purpose and without fee is hereby granted,
 provided that the above copyright notice appear in all copies and that
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