[master] 7d3aee03d Missing ssize_t definition

[Dridi Boukelmoune]

commit 7d3aee03df8e2f7488334237b28ac1db520f52bf
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Mon Aug 31 21:03:41 2020 +0200

    Missing ssize_t definition

diff --git a/bin/varnishtest/vtc_sess.c b/bin/varnishtest/vtc_sess.c
index 7105308c3..ae2284687 100644
--- a/bin/varnishtest/vtc_sess.c
+++ b/bin/varnishtest/vtc_sess.c
@@ -1,4 +1,6 @@
 
+#include <sys/types.h>
+
 #include <stdlib.h>
 #include <string.h>