liferea: fix build for libxml2 2.12

srcpkgs/liferea/patches/fix-libxml2-2.12.patch

@@ -0,0 +1,28 @@
+From be8ef494586d9ef73c04ec4ca058a9a158ae3562 Mon Sep 17 00:00:00 2001
+From: Sergei Trofimovich <slyich@gmail.com>
+Date: Sun, 31 Dec 2023 22:26:31 +0000
+Subject: [PATCH] src/node_type.h: add `#include <libxml/tree.h>` for
+ `xmlNodePtr` type
+
+Without the change build fails on `libxml2-2.12.3` as:
+
+    ../../src/node_type.h:62:64: error: unknown type name 'xmlNodePtr'; did you mean 'nodePtr'?
+       62 |         void            (*export)               (nodePtr node, xmlNodePtr cur, gboolean trusted);
+          |                                                                ^~~~~~~~~~
+          |                                                                nodePtr
+---
+ src/node_type.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/node_type.h b/src/node_type.h
+index fcd3e7223..a41ff52fc 100644
+--- a/src/node_type.h
++++ b/src/node_type.h
+@@ -23,6 +23,7 @@
+ 
+ #include "node.h"
+ 
++#include <libxml/tree.h>
+ #include <libxml/xmlmemory.h>
+ #include <gtk/gtk.h>
+