CMake: Only test stl for c++ versions before 11

build/cmake/setup.cmake

@@ -143,7 +143,7 @@ wx_check_c_source_compiles(
     stdio.h
     )
 #TODO: wxNO_VARIADIC_MACROS
-if(wxUSE_STL)
+if(wxUSE_STL AND NOT wxHAS_CXX11)
     wx_check_cxx_source_compiles("
         std::vector<int> moo;
         std::list<int> foo;
@@ -168,6 +168,12 @@ if(wxUSE_STL)
         HAVE_STD_STRING_COMPARE
         string
         )
+
+    wx_check_cxx_source_compiles(
+        "std::wstring s;"
+        HAVE_STD_WSTRING
+        string
+        )
 endif()
 
 # Check for availability of GCC's atomic operations builtins.
@@ -584,13 +590,6 @@ check_include_file(w32api.h HAVE_W32API_H)
 check_include_file(wchar.h HAVE_WCHAR_H)
 check_include_file(wcstr.h HAVE_WCSTR_H)
 
-
-wx_check_cxx_source_compiles(
-    "std::wstring s;"
-    HAVE_STD_WSTRING
-    string
-    )
-
 if(wxUSE_DATETIME)
     # check for timezone variable
     #   doesn't exist under Darwin / Mac OS X which uses tm_gmtoff instead