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

[Zachary Ware]

Zachary Ware added the comment:

Here's an even less ugly new version of the patch; it does everything with multi-byte strings instead of wide-char strings (so that there's just one conversion of prefix from wcs to mbs at the beginning of the block, and TCL_VERSION is used directly).  This patch also cleans up the Tkinter tests to remove the previous workarounds and un-reverts the change to PCbuild/rt.bat that I reverted after #15968 in an attempt to avoid test failures (that apparently didn't work).

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components: +Windows -Tests
title: Suppress 'os.environ was modified' warning on Tcl/Tk tests -> Clean up Tcl library discovery in Tkinter on Windows
versions: +Python 3.5 -Python 3.4
Added file: http://bugs.python.org/file34662/issue20035.v3.diff

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