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[libcxx] Test accessing a directory on windows that gives "access denied" errors

Authored by mstorsjo on Mar 8 2021, 2:03 AM.

Description

[libcxx] Test accessing a directory on windows that gives "access denied" errors

Fix handling of skip_permission_denied on windows; after converting
the return value of GetLastError() to a standard error_code, ec.value()
is in the standard errc range, not a native windows error code. This
was missed in 156180727d6c347eda3ba749730707acb8a48093.

The directory "C:\System Volume Information" does seem to exist and
have these properties on most relevant contempory setups.

Differential Revision: https://reviews.llvm.org/D98166