[master] 973dce377 vxp: Missing include for in64_t

[Dridi Boukelmoune]

commit 973dce377cd469ed5d156d2fe3fb155614ec7a5d
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Tue Jan 24 13:42:16 2023 +0100

    vxp: Missing include for in64_t
    
    Spotted by our Alpine Linux job on CircleCI.

diff --git a/lib/libvarnishapi/vxp.c b/lib/libvarnishapi/vxp.c
index f23ffad3f..46e086e50 100644
--- a/lib/libvarnishapi/vxp.c
+++ b/lib/libvarnishapi/vxp.c
@@ -33,6 +33,7 @@
 #include "config.h"
 
 #include <ctype.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h> /* for MUSL */