[3/3] ntdll: Implement FILE_ATTRIBUTE_HIDDEN and FILE_ATTRIBUTE_SYSTEM using unix extended attributes like samba 3 does (take 5)

[Dan Kegel]

Rediffed since last post, otherwise unchanged.

Tests pass on the mac (and on any linux new enough
to have user xattrs on by default).

Ubuntu 8.04 is getting a bit old.  If you run on that OS,
the HIDDEN and SYSTEM tests will fail unless you turn user xattrs on,
like people used to have to do for beagle.
(But it's probably easier to update to a newer Ubuntu...)

Fixes http://bugs.winehq.org/show_bug.cgi?id=15679
(unless you don't have user xattrs available).
I verified that cygwin's vi and cc work on the
mac (with two caveats: cygwin's installer only worked
with the wm-less :0.0, not with the default DISPLAY, and
wine's habit of recomputing every font metric under the
sun on every process startup made testing on the mac
painful).
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