Add wxEventLoopBase::DoRun().

Call it from public Run() after setting the loop as active and resetting
m_shouldExit flag.

No real changes, just cut down on the code duplication among the ports and
make it easier to implement the upcoming changes. see #10258.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74333 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/evtloop.h

@@ -22,7 +22,6 @@ class WXDLLIMPEXP_CORE wxGUIEventLoop : public wxEventLoopBase
 public:
     wxGUIEventLoop();
 
-    virtual int Run();
     virtual void Exit(int rc = 0);
     virtual bool Pending() const;
     virtual bool Dispatch();
@@ -38,6 +37,9 @@ public:
     void StoreGdkEventForLaterProcessing(GdkEvent* ev)
         { m_arrGdkEvents.Add(ev); }
 
+protected:
+    virtual int DoRun();
+
 private:
     // the exit code of this event loop
     int m_exitcode;