make wxSelectDispatcher ctor public, it can be useful to create it in places other than wxFDIODispatcher

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52681 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/private/selectdispatcher.h

@@ -82,8 +82,8 @@ private:
 class WXDLLIMPEXP_BASE wxSelectDispatcher : public wxMappedFDIODispatcher
 {
 public:
-    // creates an instance of this class, the caller takes ownership of it
-    static wxSelectDispatcher *Create();
+    // default ctor
+    wxSelectDispatcher() { m_maxFD = -1; }
 
     // implement pure virtual methods of the base class
     virtual bool RegisterFD(int fd, wxFDIOHandler *handler, int flags = wxFDIO_ALL);
@@ -91,10 +91,6 @@ public:
     virtual bool UnregisterFD(int fd);
     virtual void Dispatch(int timeout = TIMEOUT_INFINITE);
 
-protected:
-    // ctor is not public, use Create()
-    wxSelectDispatcher();
-
 private:
     // common part of RegisterFD() and ModifyFD()
     bool DoUpdateFDAndHandler(int fd, wxFDIOHandler *handler, int flags);