type_traits (make_signed): Remove specializations for floating point types.

type_traits (make_signed): Remove specializations for floating point types.

2007-05-08  Benjamin Kosnik  <bkoz@redhat.com>

	* include/std/type_traits (make_signed): Remove specializations
	for floating point types.
	(make_unsigned): Same.
	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Fix.
	* testsuite/20_util/make_signed/requirements/typedefs-1.cc: Same.
	* testsuite/20_util/make_signed/requirements/typedefs-2.cc: Same.
	* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc: Same.
	* testsuite/20_util/make_unsigned/requirements/typedefs-1.cc: Same.
	* testsuite/20_util/make_unsigned/requirements/typedefs-2.cc: Same.

From-SVN: r124543