[PATCH] Initialize _reent with memset, also in the _REENT_SMALL case

[Federico Terraneo]

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A while ago this patch was applied

http://www.sourceware.org/ml/newlib/2013/msg00304.html

to optimize _REENT_INIT_PTR() with a memset. However, the same change
was not done in the _REENT_SMALL case. This patch also removes
_ATEXIT_INIT_PTR() and _REENT_INIT_ATEXIT_PTR() since they're no longer
used.

newlib/ChangeLog
2013-06-23  Terraneo Federico  <fede.tft@hotmail.it>

	* libc/include/sys/reent.h (_ATEXIT_INIT_PTR): Remove.
	  (_REENT_INIT_ATEXIT_PTR): Remove.
          (_REENT_INIT_PTR): Reduce code size if _REENT_SMALL.

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