refactor Input/Output_Timeout: don't duplicate the same code in MSW/Unix code and also don't duplicate it for input and output, one function is enough for both

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57558 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/private/sockunix.h

@@ -100,9 +100,6 @@ private:
     void EnableEvent(wxSocketNotify event);
     void DisableEvent(wxSocketNotify event);
 
-
-    wxSocketError Input_Timeout();
-    wxSocketError Output_Timeout();
     int Recv_Stream(void *buffer, int size);
     int Recv_Dgram(void *buffer, int size);
     int Send_Stream(const void *buffer, int size);