[master] c2ecb4d Add back #include for solaris

[Poul-Henning Kamp]

commit c2ecb4deee2ed2c075b8ce965077ed13079c9c37
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Mon May 15 10:01:45 2017 +0000

    Add back #include for solaris

diff --git a/lib/libvarnish/vsub.c b/lib/libvarnish/vsub.c
index 9abf3f7..e3f7453 100644
--- a/lib/libvarnish/vsub.c
+++ b/lib/libvarnish/vsub.c
@@ -35,6 +35,7 @@
 
 #include <errno.h>
 #include <stdint.h>
+#include <stdlib.h>		// Solaris closefrom(3c)
 #include <string.h>
 #include <unistd.h>