Define std-related symbols in configure when using C++11 too

Even though we don't need to perform the checks for the availability of
<unordered_map> or <type_traits> headers when using C++11 because we can
safely assume they're indeed available, we still need to define the
corresponding symbols, as if the checks were performed, so that the code
inside and outside the library could test them in any case, whether
we're using C++11 or not.

configure

@@ -19111,8 +19111,20 @@ if test "x$COMPAQCXX" = "xyes"; then
                                 CXXFLAGS="-w0 -msg_disable basclsnondto,unrimpret,intconlosbit"
 fi
 
-if test "$HAVE_CXX11" != "1" ; then
+if test "$HAVE_CXX11" = "1" ; then
 
+$as_echo "#define HAVE_STD_WSTRING 1" >>confdefs.h
+
+$as_echo "#define HAVE_STD_STRING_COMPARE 1" >>confdefs.h
+
+$as_echo "#define HAVE_STD_UNORDERED_MAP 1" >>confdefs.h
+
+$as_echo "#define HAVE_STD_UNORDERED_SET 1" >>confdefs.h
+
+$as_echo "#define HAVE_TYPE_TRAITS 1" >>confdefs.h
+
+
+else
 
 
     ac_ext=cpp