* testsuite/22_locale/codecvt/codecvt_utf8/requirements/1.cc:
	Remove unused header.
	* testsuite/22_locale/codecvt/codecvt_utf16/requirements/1.cc:
	Likewise.
	* testsuite/22_locale/codecvt/codecvt_utf8_utf16/requirements/1.cc:
	Likewise.

From-SVN: r219781