Add the path to the installed Qt Frameworks on Mac.

Otherwise all the Qt headers might not be found at all.

Task-number: QTCREATORBUG-1377
Reviewed-by: Tobias Hunger
Reviewed-by: Erik Verbruggen

src/plugins/qt4projectmanager/qt4project.cpp

@@ -426,6 +426,10 @@ void Qt4Project::updateCppCodeModel()
     QStringList predefinedFrameworkPaths;
     QByteArray predefinedMacros;
 
+    QString qtFrameworkPath = activeBC->qtVersion()->frameworkInstallPath();
+    if (!qtFrameworkPath.isEmpty())
+        predefinedFrameworkPaths.append(qtFrameworkPath);
+
     ToolChain *tc = activeBC->toolChain();
     if (tc) {
         predefinedMacros = tc->predefinedMacros();