Improve inotify()-based wxFileSystemWatcher to handle creation/deletion.

Handle creation and deletion of directories under the watched path better.

See #14544.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72689 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/fswatcher_inotify.h

@@ -26,6 +26,8 @@ public:
 
     virtual ~wxInotifyFileSystemWatcher();
 
+    void OnDirDeleted(const wxString& path);
+
 protected:
     bool Init();
 };