Debugger: Set debuggee environment vars.

Env vars should be set to debuggee not to debugger.

Change-Id: I1ff877e295cb61f3a47c3aec5ffb43dea64df1cc
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/gdb/gdbengine.h

@@ -103,6 +103,7 @@ protected: ////////// Gdb Process Management //////////
     void handleGdbExit(const DebuggerResponse &response);
 
     void loadInitScript();
+    void setEnvironmentVariables();
 
     // Something went wrong with the adapter *before* adapterStarted() was emitted.
     // Make sure to clean up everything before emitting this signal.