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/cocoa/evtloop.h

@@ -20,7 +20,6 @@ class WXDLLIMPEXP_CORE wxGUIEventLoop : public wxEventLoopBase
 public:
     wxGUIEventLoop() { m_exitcode = 0; }
 
-    virtual int Run();
     virtual void Exit(int rc = 0);
     virtual bool Pending() const;
     virtual bool Dispatch();
@@ -29,6 +28,8 @@ public:
     virtual bool YieldFor(long eventsToProcess);
 
 protected:
+    virtual int DoRun();
+
     int m_exitcode;
 
     wxDECLARE_NO_COPY_CLASS(wxGUIEventLoop);