Fix k3b musicbrainz moc run failure under Qt4

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/k3b@1238521 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

src/projects/k3bmusicbrainzjob.h

@@ -1,4 +1,4 @@
-/* 
+/*
  *
  * $Id: k3bmusicbrainzjob.h 630384 2007-02-05 09:33:17Z mlaurent $
  * Copyright (C) 2005 Sebastian Trueg <trueg@k3b.org>
@@ -20,6 +20,10 @@
 #include <config.h>
 #endif
 
+#ifdef Q_MOC_RUN
+#define HAVE_MUSICBRAINZ
+#endif // Q_MOC_RUN
+
 #ifdef HAVE_MUSICBRAINZ
 
 #include <k3bjob.h>