Minor updates to failing tests. NFC

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@260202 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/input.output/iostream.format/quoted.manip/quoted_char.fail.cpp

@@ -16,7 +16,11 @@
 #include <string>
 #include <cassert>
 
-#if _LIBCPP_STD_VER > 11
+#include "test_macros.h"
+
+//	Test that mismatches between strings and wides streams are diagnosed
+
+#if TEST_STD_VER > 11
 
 void round_trip ( const char *p ) {
     std::wstringstream ss;

test/std/input.output/iostream.format/quoted.manip/quoted_traits.fail.cpp

@@ -16,7 +16,11 @@
 #include <string>
 #include <cassert>
 
-#if _LIBCPP_STD_VER > 11
+#include "test_macros.h"
+
+#if TEST_STD_VER > 11
+
+//	Test that mismatches in the traits between the quoted object and the dest string are diagnosed.
 
 template <class charT>
 struct test_traits