[libxml2] Don't use xmlValidateName() when not available.

[Daniel Veillard <veillard src gnome org>]

commit 3313d14f9d71e5beeb51169688b69f3a34fe4489
Author: Nicolas Le Cam <niko lecam gmail com>
Date:   Fri Jun 14 21:11:27 2013 +0200

    Don't use xmlValidateName() when not available.
    
    Fix compilation with minimum and debug.

 debugXML.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/debugXML.c b/debugXML.c
index 3c13783..8aab703 100644
--- a/debugXML.c
+++ b/debugXML.c
@@ -254,10 +254,12 @@ xmlCtxtCheckName(xmlDebugCtxtPtr ctxt, const xmlChar * name)
            xmlDebugErr(ctxt, XML_CHECK_NO_NAME, "Name is NULL");
            return;
        }
+#if defined(LIBXML_TREE_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
         if (xmlValidateName(name, 0)) {
            xmlDebugErr3(ctxt, XML_CHECK_NOT_NCNAME,
                         "Name is not an NCName '%s'", (const char *) name);
        }
+#endif
        if ((ctxt->dict != NULL) &&
            (!xmlDictOwns(ctxt->dict, name)) &&
             ((ctxt->doc == NULL) ||