[TCLCORE] [PATCH-for-8.5-tobe] X11+Cygwin should be okay.

[Konovalov, V. <vko...@sp...>]

the more I use X11 at work, the more I need to also to use Tcl/Tk within X11
on cygwin.
Tcl/Tk coming with cygwin is built with Win32 native GUI, but it I want
different approach.

Tk is actually cleanly builds in such a configuration, except for a small
quirk.

Attached patch is trivial but relies on fact that X.h defines X_PROTOCOL.
I am very weak at X11/c programming so I could be wrong with exact details,
but please consider solving this problem somehow.

Best regards,
Vadim.