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vs_toolchain.py gets a directory listing for win_sdk_dir\bin and then
sorts it by converting the 10.x.x.x directory names to tuples of
integers. This fails on Python 3 because int and str types are not
comparable so directories with non-integral (non-version) names caused
comparison failures when compared against integral (version) names. This
change filters out the unwanted names before sorting instead of after
sorting, which lets this work on Python 3 (tested by running manually).

A misleading variable name was also changed.

This was reported by a pdfium user.

Change-Id: Ifb0accd831945c6d0eb44e838071b8ddd609ddb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309454
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Auto-Submit: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790446}