[issue5799] Change ntpath functions to implicitly support UNC paths

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

I confirm that the cygwin port uses posixpath, and that the current
patch has no impact there, except for users which explicitly import
ntpath to get nt semantics.

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nosy: +amaury.forgeotdarc

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