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

[Steve Dower]

Steve Dower added the comment:

There's an MSBuild property that I set for release builds (either BuildForRelease or ReleaseBuild, not Configuration) that should exclude the preprocessor directive so we don't include an unnecessary full path. I can make that change later if you don't want to hold this patch up any longer though, as the rest looks fine to me. I don't know enough about Tix to comment on Serhiy's point.

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<http://bugs.python.org/issue20035>
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