added wxSocket::ShutdownOutput() (closes #9229)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57656 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/socket.h

@@ -819,6 +819,15 @@ public:
     */
     void Close();
 
+    /**
+        Shuts down the writing end of the socket.
+
+        This function simply calls the standard shutdown() function on the
+        underlying socket, indicating that nothing will be written to this
+        socket any more.
+     */
+    void ShutdownOutput();
+
     /**
         This function simply deletes all bytes in the incoming queue. This function
         always returns immediately and its operation is not affected by IO flags.