[libxml2] Add XML_DEPRECATED to ignored keywords

[Nick Wellnhofer <nwellnhof src gnome org>]

commit d4f90698f4a310a3800063317463200055aa5c11
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Wed Mar 2 17:35:39 2022 +0100

    Add XML_DEPRECATED to ignored keywords
    
    Fixes the API documentation generator.

 doc/apibuild.py | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/doc/apibuild.py b/doc/apibuild.py
index 9ed1b33f..2fbe11a9 100755
--- a/doc/apibuild.py
+++ b/doc/apibuild.py
@@ -81,6 +81,7 @@ ignored_words = {
   "LIBXML_ATTR_FORMAT": (5, "macro for gcc printf args checking extension"),
   "LIBXML_ATTR_ALLOC_SIZE": (3, "macro for gcc checking extension"),
   "ATTRIBUTE_NO_SANITIZE": (3, "macro keyword"),
+  "XML_DEPRECATED": (0, "macro keyword"),
 }
 
 def escape(raw):