[master] 84d92b4 Missed an underscore

[Poul-Henning Kamp]

commit 84d92b486b9d2d9a74f1c3f49457e44bbe14c674
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Thu Jan 11 22:07:50 2018 +0000

    Missed an underscore

diff --git a/bin/varnishtest/vtc_process.c b/bin/varnishtest/vtc_process.c
index b8573b7..84b31cc 100644
--- a/bin/varnishtest/vtc_process.c
+++ b/bin/varnishtest/vtc_process.c
@@ -38,8 +38,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#ifdef _sun
-#include <stropts.h>
+#ifdef __sun
+#  include <stropts.h>
 #endif
 #include <termios.h>
 #include <unistd.h>