Remove support for Madde-based platforms.

With Nokia's decision to stop support for Harmattan applications
in their app store, the last remains of a use case have disappeared.

Change-Id: Ia036112de01c8c3a866da3529b4a941db11c7358
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/debugger/debuggerrunner.h

@@ -72,7 +72,7 @@ public:
     void startFailed();
     void debuggingFinished();
     ProjectExplorer::RunConfiguration *runConfiguration() const;
-    DebuggerEngine *engine(); // FIXME: Remove. Only used by Maemo support.
+    DebuggerEngine *engine();
 
     void showMessage(const QString &msg, int channel);