[PATCH] Fix environ.c on darwin

[Andrew Pinski <pinskia at physics dot uc dot edu>]

This is basically the patch from the PR for this (PR 17748) with
an additional comment which says why this is needed.
The problem is that even though darwin has a man page for environ,
it does not really have the variable but does have a function,
_NSGetEnviron, which does the same thing as the variable.

OK? Built and tested on powerpc-darwin.

Thanks,
Andrew Pinski

libgfortran/ChangeLog:
DATE  Peter O'Gorman  <peter@pogma.com>
	 Andrew Pinski  <pinskia@physics.uc.edu>

	* configure.ac: Add check for the crt_externs.h header.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* runtime/environ.c: If we have HAVE_CRT_EXTERNS_H, then define
	environ as calling _NSGetEnviron, otherwise define it as an external
	variable.

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