Change wxWakeUpPipe to be a wxEventLoopSourceHandler.

No real changes but use wxEventLoopSource::AddSourceForFD() instead of
wxFDIODispatcher::RegisterFD() for this pipe because this is the preferred way
and because it will allow reusing this class for wxExecute() purposes later.

See #10258.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74346 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/evtloop.h

@@ -17,8 +17,8 @@
 // wxConsoleEventLoop
 // ----------------------------------------------------------------------------
 
+class wxEventLoopSource;
 class wxFDIODispatcher;
-class wxUnixEventLoopSource;
 class wxWakeUpPipeMT;
 
 class WXDLLIMPEXP_BASE wxConsoleEventLoop
@@ -49,6 +49,9 @@ private:
     // the event loop in the main thread it writes to this pipe
     wxWakeUpPipeMT *m_wakeupPipe;
 
+    // the event loop source used to monitor this pipe
+    wxEventLoopSource* m_wakeupSource;
+
     // either wxSelectDispatcher or wxEpollDispatcher
     wxFDIODispatcher *m_dispatcher;