Move wxEventLoopManual::m_shouldExit to wxEventLoopBase.

No real changes, just make this flag available to the other event loop
implementations as they will need it soon.

See #10258.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74332 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/evtloop.h

@@ -177,6 +177,9 @@ protected:
     // the pointer to currently active loop
     static wxEventLoopBase *ms_activeLoop;
 
+    // should we exit the loop?
+    bool m_shouldExit;
+
     // YieldFor() helpers:
     bool m_isInsideYield;
     long m_eventsToProcessInsideYield;
@@ -212,9 +215,6 @@ protected:
     // the loop exit code
     int m_exitcode;
 
-    // should we exit the loop?
-    bool m_shouldExit;
-
 private:
     // process all already pending events and dispatch a new one (blocking
     // until it appears in the event queue if necessary)