added qt4 includes to ladspa stuff

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@301 0778d3d1-df1d-0410-868b-ea421aaaa00d

src/core/effect.cpp

@@ -27,8 +27,17 @@
 #include "ladspa_manager.h"
 #ifdef LADSPA_SUPPORT
 
+#ifdef QT4
+
+#include <QtGui/QMessageBox>
+
+#else
+
 #include "qmessagebox.h"
 
+#endif
+
+
 #include "effect.h"
 #include "mixer.h"
 #include "config_mgr.h"