[patch] New option --disable-reenterable-atexit

[Joey Ye]

Updated patch according to Sebastian's comments.

OK to trunk?

ChangeLog:
2013-10-17  Joey Ye  <joey.ye@arm.com>

	configure.in (enable-global-atexit): New option.
	configure: Regenerated.
	newlib.hin (_REENT_GLOBAL_ATEXIT): Place-holder.
	README (enable-global-atexit): Description for
	new option.
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