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bug#5815: clean up extern int errno usage

From: Dan Nicolaescu
Subject: bug#5815: clean up extern int errno usage
Date: Wed, 31 Mar 2010 16:09:34 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

Some files still use "extern int errno" declarations.

Those should not be needed. For example dired.c unconditionally
include <errno.h>, and it has done so for a very long time.

"extern int errno" will cause problems with multithreaded code. 

So I'd like to remove all instances of errno declaration, and just
include errno.h (if not already included).

Any objection?

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