Debugger: Re-work qt namespace detection with gdb

We can always use python now. Avoids one roundtrip on startup,
a temporary file, and only does it when needed.

Change-Id: Id32a812bec477307da1d93950f7758f3a5699464
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/gdb/gdbengine.h

@@ -96,7 +96,6 @@ protected: ////////// Gdb Process Management //////////
     void startGdb(const QStringList &args = QStringList());
     void handleInferiorShutdown(const GdbResponse &response);
     void handleGdbExit(const GdbResponse &response);
-    void handleNamespaceExtraction(const GdbResponse &response);
 
     void loadInitScript();