bug#29231: 26.0.90; invald file name for symbolic files

[Paul Eggert]

Paul Eggert wrote:
> Alan Third wrote:
> > Only with symlinks faccessat returns success if it’s pointing to a
> > file and you put ‘/’ on the end.
>
> This is a well-known problem on macOS, and Emacs is supposed to compile a 
> replacement fstatat function

Whoops, you were writing about faccessat whereas I was thinking about fstatat. 
Please ignore my previous email, and sorry about the confusion.

Apparently macOS faccessat has a problem similar to fstatat. Gnulib did not work 
around the faccessat problem, so I wrote and installed a fix for this into 
Gnulib and installed the attached patch into the emacs-26 branch. Please give it 
a try.

0001-Merge-from-Gnulib.txt
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