explicitly call OnExit() in the ports which don't use wxEventLoopManual

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43840 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/os2/evtloop.cpp

@@ -277,6 +277,8 @@ int wxEventLoop::Run()
             wxMilliSleep(10);
     }
 
+    OnExit();
+
     return m_impl->GetExitCode();
 }