xmlstarlet: fix compile with libxml 2.14.0

ref: 208f27f964/libxml.h

packages/textproc/xmlstarlet/patches/xmlstarlet-0900-fix-compile-with-libxml-2-14-0.patch

@@ -0,0 +1,26 @@
+From 10684eea54a2c3b0b3738dfd8d70014f54e8e282 Mon Sep 17 00:00:00 2001
+From: Rudi Heitbaum <rudi@heitbaum.com>
+Date: Sat, 29 Mar 2025 02:23:34 +1100
+Subject: [PATCH] Fix build with libxml2-2.14.0
+
+---
+ src/xml_pyx.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/src/xml_pyx.c b/src/xml_pyx.c
+index ab295f12..e5ec64f1 100644
+--- a/src/xml_pyx.c
++++ b/src/xml_pyx.c
+@@ -21,6 +21,12 @@
+ 
+ #include "xmlstar.h"
+ 
++#if __GNUC__ * 100 + __GNUC_MINOR__ >= 207
++  #define ATTRIBUTE_UNUSED __attribute__((unused))
++#else
++  #define ATTRIBUTE_UNUSED
++#endif
++
+ /**
+  *  Output newline and tab characters as escapes
+  *  Required both for attribute values and character data (#PCDATA)