Don't put POLLHUP in .events

POLLHUP is always checked for, and is output-only on Linux and OSX, so
avoid putting it in the list of events we check for.

bin/varnishtest/vtc_http.c

@@ -1043,7 +1043,7 @@ cmd_http_expect_close(CMD_ARGS)
 	vtc_log(vl, 4, "Expecting close (fd = %d)", hp->fd);
 	while (1) {
 		fds[0].fd = hp->fd;
-		fds[0].events = POLLIN | POLLHUP | POLLERR;
+		fds[0].events = POLLIN | POLLERR;
 		fds[0].revents = 0;
 		i = poll(fds, 1, 1000);
 		if (i == 0)

bin/varnishtest/vtc_varnish.c

@@ -395,16 +395,8 @@ varnish_launch(struct varnish *v)
 	fd[0].fd = v->cli_fd;
 	fd[0].events = POLLIN;
 	fd[1].fd = v->fds[0];
-	fd[1].events = POLLHUP;
-#ifdef __APPLE__
-	/*
-	 * OSX cannot poll a pipe for POLLHUP only, poll just returns
-	 * zero with no revents.
-	 */
-	i = poll(fd, 1, 10000);
-#else
+	fd[1].events = 0; /* Only care about POLLHUP, which is output-only */
 	i = poll(fd, 2, 10000);
-#endif
 	vtc_log(v->vl, 4, "CLIPOLL %d 0x%x 0x%x",
 	    i, fd[0].revents, fd[1].revents);
 	if (i == 0) {