File castget-stdlib.diff of Package castget

From https://github.com/mlj/castget/commit/5bce05882ca34b3fd4e1c3667a3e8336c1f3ed2f
(adjusted to match 2.0.1)

Fixes https://github.com/mlj/castget/issues/65


commit 5bce05882ca34b3fd4e1c3667a3e8336c1f3ed2f
Author: Marius L. Jøhndal <mariuslj@ifi.uio.no>
Date:   Mon Jan 20 22:37:40 2025 +0000

    Include stdlib.h for strtol() (#65).

Index: castget-2.0.1/src/libxmlutil.c
===================================================================
--- castget-2.0.1.orig/src/libxmlutil.c	2017-06-15 20:20:38.000000000 +0200
+++ castget-2.0.1/src/libxmlutil.c	2025-12-04 20:28:13.774943177 +0100
@@ -21,6 +21,7 @@
 #include "config.h"
 #endif /* HAVE_CONFIG_H */
 
+#include <stdlib.h>
 #include <string.h>
 #include "libxmlutil.h"