C++: Enable C++11 keywords in macro uses

Just in case compilers id defining such things.

Change-Id: Ica6af8462e90bfab2bfa883ec12d5e648d6d33db
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/cpptools/cpphighlightingsupportinternal.cpp

@@ -69,6 +69,7 @@ QFuture<CppHighlightingSupport::Use> CppHighlightingSupportInternal::highlightin
         SimpleLexer tokenize;
         tokenize.setQtMocRunEnabled(false);
         tokenize.setObjCEnabled(false);
+        tokenize.setCxx0xEnabled(true);
         const QList<Token> tokens = tokenize(name);
         if (tokens.length() && (tokens.at(0).isKeyword() || tokens.at(0).isObjCAtKeyword()))
             continue;