[1.7] bugs in faccessat

[Eric Blake]

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According to Eric Blake on 9/3/2009 9:58 AM:
> faccessat has at least two, and probably three bugs.

Here's a fix for 1 (typo) and 3 (check for EINVAL in more places), but not
for 2 (euidaccess, and the followup request of lchmod).

2009-09-03  Eric Blake  <ebb9@byu.net>

	* syscalls.cc (faccessat): Fix typo, reject bad flags.
	(fchmodat, fchownat, fstatat, utimensat, linkat, unlinkat): Reject
	bad flags.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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