bug#16133: 24.3; copy-file fails on chmod when copying to FAT filesystem

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Date: Sat, 14 Dec 2013 15:19:33 -0500
> Cc: Paul Eggert <eggert@cs.ucla.edu>, 16133@debbugs.gnu.org
> 
> Since copy-file has only relatively recently starting giving an error,
> maybe the least bad thing would be for it to give a message instead of
> an error?

Yes, I think this is the way to go.  That's what "cp -p" does, FWIW.