Fixes: Find the qplatformdefs.h file

Task:     -
RevBy:    -
AutoTest: -
Details:  Add the include path for qplatformdefs.h to the fot.

src/plugins/qt4projectmanager/qt4project.cpp

@@ -474,6 +474,9 @@ void Qt4Project::updateCodeModel()
         }
     }
 
+    // Add mkspec directory
+    allIncludePaths.append(qtVersion(activeBuildConfiguration())->mkspecPath());
+
     QStringList files;
     files += m_projectFiles->files[HeaderType];
     files += m_projectFiles->generatedFiles[HeaderType];