[libxml2] Don't forget to install xmlversion.h

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 39dfb048a8f8fd33496801a3fef7e1f6f139d047
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Fri Aug 26 02:41:15 2022 +0200

    Don't forget to install xmlversion.h
    
    Fixes 7f7961df.

 include/libxml/Makefile.am | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/include/libxml/Makefile.am b/include/libxml/Makefile.am
index cb717cf6..5915e3ec 100644
--- a/include/libxml/Makefile.am
+++ b/include/libxml/Makefile.am
@@ -49,4 +49,6 @@ xmlinc_HEADERS = \
                xmlsave.h \
                schematron.h
 
+nodist_xmlinc_HEADERS = xmlversion.h
+
 EXTRA_DIST = xmlversion.h.in