[patch] errno.texi: Clarify some GNU extensions

[Ulrich Drepper]

Ben Collins <bcollins@debian.org> writes:

> 2001-10-24  Ben Collins  <bcollins@debian.org>
> 
> 	* manual/errno.texi: Clarify that program_invocation_name and
> 	program_invocation_short_name require _GNU_SOURCE. Also fix
> 	example usage to reflect this.

This isn't necessary.  Throughout the manual we say "this is a GNU
extension" and this always means you'll have to define _GNU_SOURCE to
use (if this is about an additional interface).

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