* include/experimental/any (any_v1): Rename namespace to
	fundamentals_v1. Change string returned by bad_any_cast::what().
	* include/experimental/optional (fundamentals_v1): Add namespace.
	* include/experimental/string_view (fundamentals_v1): Likewise.
	* testsuite/experimental/any/typedefs.cc: New.
	* testsuite/experimental/optional/typedefs.cc: New.
	* testsuite/experimental/string_view/typedefs.cc: New.

From-SVN: r211920