shlwapi: Correctly treat '.' when enumerating files in PathIsDirectoryEmptyW.

[Sebastian Lackner]

From: Michael Müller <michael at fds-team.de>
Fixes https://bugs.winehq.org/show_bug.cgi?id=26272

Btw, it would also be nice to get some feedback for http://source.winehq.org/patches/data/108376 before it drops out of the list. On the corresponding bugreport (#37046) Jacek Caban already looked at it and confirmed it to be correct.

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 dlls/shlwapi/path.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)
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