[PATCH] PR21482: long paths on Windows

[Robinson, Paul]

Support directory names longer than 248 characters on Windows.

The normal Windows path limit is 260 characters; the limit for directory
names is 248, to leave room for an 8.3 filename at the end.  Adding the
'\\?\' prefix greatly expands these limits.  Intercept path names that
we are about to pass to the Windows APIs and add the prefix if necessary.

Also correct the comment about the state of the temporary directory used
by the Support unittests.
--paulr

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