Trk/S60: Wire debugger parameters.

Remove conditionals from toolchain enumeration, pass parameters to
TrkGdbAdapter, rename function in runconfig, derive symbol
file from local exe file.

src/plugins/debugger/gdb/gdbengine.h

@@ -395,6 +395,7 @@ private:
     void setLocals(const QList<GdbMi> &locals);
     void connectDebuggingHelperActions();
     void disconnectDebuggingHelperActions();
+    AbstractGdbAdapter *determineAdapter(const DebuggerStartParametersPtr &dp) const;
 
     bool startModeAllowsDumpers() const;
     QString parseDisassembler(const GdbMi &lines);