Don't use -1 fd and AT_SYMLINK_NOFOLLOW for faccessat()

-1 is not an allowed value for the file descriptor, the only
allowed non-file-descriptor value is AT_FDCWD. So use that
instead.

AT_SYMLINK_NOFOLLOW has a weird semantic: It checks whether
we have the specified access on the symbolic link. It also
is implemented only by glibc on Linux, so it's inherently
non-portable. We should just drop it.

Thanks: James Clarke for debugging these issues
Reported-by: James Clarke <jrtc27@jrtc27.com>
(cherry picked from commit 25f54c960d7a4ceca7bd3e21f87baf48d6cbc2d3)

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