[libxslt] Add missing #include

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 8fcf0fd683d50b4b1bd4ed067837b3f1415d6b22
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Thu Jun 1 16:46:24 2017 +0200

    Add missing #include

 libxslt/transform.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/libxslt/transform.c b/libxslt/transform.c
index 85ad3a2..a9e8ffe 100644
--- a/libxslt/transform.c
+++ b/libxslt/transform.c
@@ -19,6 +19,7 @@
 #define IN_LIBXSLT
 #include "libxslt.h"
 
+#include <limits.h>
 #include <string.h>
 #include <stdio.h>