re PR libstdc++/51785 (gets not anymore declared)

re PR libstdc++/51785 (gets not anymore declared)

2012-03-01  Benjamin Kosnik  <bkoz@redhat.com>
            Ramana Radhakrishnan <ramana@gcc.gnu.org>

	PR libstdc++/51785
	* acinclude.m4 (GLIBCXX_CHECK_STDIO_PROTO): New.
	* configure.ac: Call it.
	* configure: Regenerate.
	* config.h.in: Same.
	* config/os/gnu-linux/os_defines.h: Conditionally undefine
	_GLIBCXX_HAVE_GETS.
	* include/c_global/cstdio: Conditionally declare deprecated gets.
	* include/c_std/cstdio: Same.

Co-Authored-By: Ramana Radhakrishnan <ramana@gcc.gnu.org>
From-SVN: r184774