[3/3] ntdll: Implement FILE_ATTRIBUTE_HIDDEN and FILE_ATTRIBUTE_SYSTEM support

[Dan Kegel]

Implement hidden and system file attributes.
Removes some todo_wine statements from the tests, too.

Changes since first posted:
- broke out tests and DIR_get_attributes into patches 1 and 2
- dropped programs/cmd changes for the moment
- stopped trying to implement FILE_ATTRIBUTE_ARCHIVE,
just left it the way it is now
- save attributes specified during NtCreateFile (I seem to
have missed that last time)
- hid platform differences behind trivial wrapper functions
to avoid #ifdef thicket

Note: the extra call to get the fd in NtCreateFile seems funny.
Hints about a cleaner way to do this would be welcome.

Still fixes http://bugs.winehq.org/show_bug.cgi?id=15679
Tests pass on both wine and Vista Home Basic (with some
todos)
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