functional_hash.h: Add ext/numeric_traits.h.

2007-09-08  Benjamin Kosnik  <bkoz@redhat.com>

	* include/bits/functional_hash.h: Add ext/numeric_traits.h.
	* include/tr1/functional_hash.h Same.
	* include/tr1/functional: Remove string, ext/type_traits.h includes.
	* include/tr1_impl/functional_hash.h: Move string, wstring
	definitions for std::<hash>::operator into separate file.
	* include/std/functional
	* src/hash.cc: New, move definitions here.
	* src/hash_c++0x.cc: Same.
	* src/Makefile.am: Add new source files.
	* configure: Regenerate.
	* Makefile.in: Same.
	* src/Makefile.in: Same.
	* po/Makefile.in: Same.
	* libmath/Makefile.in: Same.
	* libsupc++/Makefile.in: Same.
	* testsuite/Makefile.in: Same.
	* config/abi/pre/gnu.ver: Add symbols.
	* config/abi/pre/gnu-versioned-namespace.ver: Same, fix.

From-SVN: r128278