[issue45582] Rewrite getpath.c in Python

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

It's one data point (well, statistics over 1000 points), but it looks like it's actually a slight improvement in performance over the previous code on Windows :)

    before   after
min 23.103   22.154
25% 25.069   23.59925
50% 25.8125  24.2715
75% 26.65175 24.89575
max 147.567  138.997

Going to run a Linux test as well, since that was a completely different code path, but assuming it's not drastically different then I'll go ahead and merge.

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