make sure ATTRIBUTE_UNUSED is always put after the attribute declaration,

* xinclude.c xmlschemas.c xmlschemastypes.c xpath.c: make sure
  ATTRIBUTE_UNUSED is always put after the attribute declaration,
  not before
Daniel
diff --git a/xpath.c b/xpath.c
index 9aa8a3a..e754d6f 100644
--- a/xpath.c
+++ b/xpath.c
@@ -1284,8 +1284,8 @@
  * Formats an error message.
  */
 void
-xmlXPatherror(xmlXPathParserContextPtr ctxt, ATTRIBUTE_UNUSED const char *file,
-              ATTRIBUTE_UNUSED int line, int no) {
+xmlXPatherror(xmlXPathParserContextPtr ctxt, const char *file ATTRIBUTE_UNUSED,
+              int line ATTRIBUTE_UNUSED, int no) {
     int n;
     const xmlChar *cur;
     const xmlChar *base;