Fix FTBFS under Slackware

git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdemultimedia@1174629 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

kmix/mixertoolbox.cpp

@@ -28,11 +28,12 @@
 
 #include "mixdevice.h"
 #include "mixer.h"
-
-#include "kmix-platforms.cpp"
+#include "mixer_backend.h"
 
 #include "mixertoolbox.h"
 
+typedef DevIterator* getDevIteratorFunc( );
+
 /***********************************************************************************
  Attention:
  This MixerToolBox is linked to the KMix Main Program, the KMix Applet and kmixctrl.