v3 of --stderr=FILE patches

[Austin Clements]

LGTM.

Quoth Tomi Ollila on May 28 at  9:38 pm:
> This is v3 of id:1369557954-13439-1-git-send-email-tomi.ollila at iki.fi
> 
> In id:m2a9nfr4tb.fsf at guru.guru-group.fi I suggested to use 0600 as
> permission bits so that files written to /tmp would not have write
> bits set in any case. That would have been inconsistent what is
> normally expected in redirection cases. The problem I described
> is easily avoided in emacs as (make-temp-file "nmerr") will create
> file "/tmp/nmerrXXXXXX" with permissions 0600 -- and writing to
> that already-created file will not change its permissions. Writing
> elsewhere is usually covered with directory permissions.