At least correct the compile error until we decide what to for real.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28688 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/unix/gsocket.cpp

@@ -1131,7 +1131,7 @@ void GSocket::UnsetCallback(GSocketEventFlags flags)
 GSocketError GSocket::GetSockOpt(int level, int optname,
                                 void *optval, int *optlen)
 {
-    if (getsockopt(m_fd, level, optname, optval, optlen) == 0)
+    if (getsockopt(m_fd, level, optname, optval, (SOCKLEN_T*)optlen) == 0)
     {
         return GSOCK_NOERROR;
     }