[master] ac64b5120 vct: Missing ssize_t

[Dridi Boukelmoune]

commit ac64b51206f0ebcae83ebac93d55c8d54fc92b33
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Mon Aug 30 10:57:47 2021 +0200

    vct: Missing ssize_t

diff --git a/lib/libvarnish/vct.c b/lib/libvarnish/vct.c
index 4bf6004a7..6993e22e6 100644
--- a/lib/libvarnish/vct.c
+++ b/lib/libvarnish/vct.c
@@ -32,6 +32,8 @@
 
 #include "config.h"
 
+#include <sys/types.h>
+
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>