Fix Krazy warnings about includes/header guards in QML-Projectmanager.

Change-Id: I3972016d65b789be5c689582afd7d6b9968b0767
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
Reviewed-by: Christiaan Janssen <christiaan.janssen@digia.com>

src/plugins/qmlprojectmanager/qmlprojectmanagerconstants.h

@@ -27,6 +27,9 @@
 **
 ****************************************************************************/
 
+#ifndef QMLPROJECTMANAGERCONSTANTS_H
+#define QMLPROJECTMANAGERCONSTANTS_H
+
 #include <qglobal.h>
 
 namespace QmlProjectManager {
@@ -41,3 +44,5 @@ const char USER_ENVIRONMENT_CHANGES_KEY[] = "QmlProjectManager.QmlRunConfigurati
 
 } // namespace Constants
 } // namespace QmlProjectManager
+
+#endif // QMLPROJECTMANAGERCONSTANTS_H