[issue20035] Clean up Tcl library discovery in Tkinter on Windows

[Zachary Ware]

Zachary Ware added the comment:

I committed a presence test for Tix in #21337 that should catch problems with loading Tix after this patch.  There shouldn't be any problem though, we actually install Tix into Tcl/Tk whereas TIX_LIBRARY is (to my understanding) for helping Tcl/Tk find a Tix that it can't find itself.

Steve, I think I have BuildForRelease patched in properly; it works with BuildForRelease unset at least :)

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Added file: http://bugs.python.org/file39416/issue20035.v7.diff

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