Fix poll not waking up on connect on win32

Under windows, poll does not detect connected socket using
POLLOUT but POLLWRNORM.
"Pending connect requests are indicated in the returned revents member of WSAPOLLFD structure by POLLWRNORM."
http://msdn.microsoft.com/en-us/library/ms741669%28VS.85%29.aspx
However, I did not test that fix. (no windows at hands). I also don't know
if the poll emulation layer works with that too.

libssh/socket.c

@@ -188,7 +188,11 @@ int ssh_socket_pollcallback(ssh_poll_handle p, int fd, int revents, void *v_s){
 			}
 		}
 	}
+#ifdef _WIN32
+	if(revents & POLLOUT || revents & POLLWRNORM){
+#else
 	if(revents & POLLOUT){
+#endif
 		/* First, POLLOUT is a sign we may be connected */
 		if(s->state == SSH_SOCKET_CONNECTING){
 			ssh_log(s->session,SSH_LOG_PACKET,"Received POLLOUT in connecting state");
@@ -797,6 +801,9 @@ int ssh_socket_connect(ssh_socket s, const char *host, int port, const char *bin
 	s->state=SSH_SOCKET_CONNECTING;
 	/* POLLOUT is the event to wait for in a nonblocking connect */
 	ssh_poll_set_events(ssh_socket_get_poll_handle(s),POLLOUT);
+#ifdef _WIN32
+	ssh_poll_add_events(ssh_socket_get_poll_handle(s),POLLWRNORM);
+#endif
 	leave_function();
 	return SSH_OK;
 }