[libxslt] Fix callback signatures in Python bindings

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 51b79bfa90c145a8ff90cc09f93da17130491ef2
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Tue Jan 16 19:04:33 2018 +0100

    Fix callback signatures in Python bindings

 python/libxslt.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/python/libxslt.c b/python/libxslt.c
index 6db61c5..ee26d68 100644
--- a/python/libxslt.c
+++ b/python/libxslt.c
@@ -180,7 +180,7 @@ static xmlHashTablePtr libxslt_extModuleElements = NULL;
 static xmlHashTablePtr libxslt_extModuleElementPreComp = NULL;
 
 static void
-deallocateCallback(void *payload, xmlChar *name ATTRIBUTE_UNUSED) {
+deallocateCallback(void *payload, const xmlChar *name ATTRIBUTE_UNUSED) {
     PyObject *function = (PyObject *) payload;
 
 #ifdef DEBUG_EXTENSIONS
@@ -191,7 +191,7 @@ deallocateCallback(void *payload, xmlChar *name ATTRIBUTE_UNUSED) {
 }
 
 static void
-deallocateClasse(void *payload, xmlChar *name ATTRIBUTE_UNUSED) {
+deallocateClasse(void *payload, const xmlChar *name ATTRIBUTE_UNUSED) {
     PyObject *class = (PyObject *) payload;
 
 #ifdef DEBUG_EXTENSIONS