fix normalize path for Windows

[cjc7373]

Fixes #7625

[uranusjr]

A news file would be nice since this is fixing a bug that users would want to know about.

[uranusjr]

I wonder if it is possible to add a test for this. Probably not since we can’t know (without complex poking) whether the test site has another disk drive we can use 😐

@xppt Would it be able for you to try out this fix and see whether it fixes the problem?

[cjc7373]

@uranusjr I've tested python [...]\src\pip install gevent==1.5a4 --no-binary gevent (refer to #7625 (comment)), no error occurred.
As for the test, not sure how to do it..

[xppt]

Sorry it took me so long to try the fix.
I've been able to reproduce the issue on revision ee3e079~ (parent), but not on ee3e079 itself.
Seems fixed to me.

[BrownTruck]

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[pradyunsg]

Reminder that this PR needs to be updated.

[cjc7373]

Updated. (Since the normpath function has been deleted I applied my change to _fs_to_record_path function)