Replace uses of C++14 remove_cv_t alias in C++11 header

	* include/experimental/bits/fs_path.h (path::_S_convert): Replace
	uses of C++14 std::remove_cv_t alias template.

From-SVN: r243355

libstdc++-v3/ChangeLog

 2016-12-07  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/experimental/bits/fs_path.h (path::_S_convert): Replace
+	uses of C++14 std::remove_cv_t alias template.
+
 	* testsuite/28_regex/traits/char/user_defined.cc: Replace uses of
 	C++14 std::exchange function.
 

libstdc++-v3/include/experimental/bits/fs_path.h

@@ -418,7 +418,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       _S_convert(_Iter __first, _Iter __last)
       {
 	using __value_type = typename std::iterator_traits<_Iter>::value_type;
-	return _Cvt<remove_cv_t<__value_type>>::_S_convert(__first, __last);
+	return _Cvt<typename remove_cv<__value_type>::type>::
+	  _S_convert(__first, __last);
       }
 
     template<typename _InputIterator>
@@ -426,7 +427,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       _S_convert(_InputIterator __src, __null_terminated)
       {
 	using _Tp = typename std::iterator_traits<_InputIterator>::value_type;
-	std::basic_string<remove_cv_t<_Tp>> __tmp;
+	std::basic_string<typename remove_cv<_Tp>::type> __tmp;
 	for (; *__src != _Tp{}; ++__src)
 	  __tmp.push_back(*__src);
 	return _S_convert(__tmp.c_str(), __tmp.c_str() + __tmp.size());