added (void *) type override to prevent warning on Solaris (Bug 132671)

* xpath.c: added (void *) type override to prevent
  warning on Solaris (Bug 132671)
diff --git a/xpath.c b/xpath.c
index 6d6e336..c42e009 100644
--- a/xpath.c
+++ b/xpath.c
@@ -563,13 +563,13 @@
 	 (op == XPATH_OP_COLLECT))) {
         if (value4 != NULL) {
 	    comp->steps[comp->nbStep].value4 = 
-	        xmlDictLookup(comp->dict, value4, -1);
+	        (void *)xmlDictLookup(comp->dict, value4, -1);
 	    xmlFree(value4);
 	} else
 	    comp->steps[comp->nbStep].value4 = NULL;
         if (value5 != NULL) {
 	    comp->steps[comp->nbStep].value5 = 
-	        xmlDictLookup(comp->dict, value5, -1);
+	        (void *)xmlDictLookup(comp->dict, value5, -1);
 	    xmlFree(value5);
 	} else
 	    comp->steps[comp->nbStep].value5 = NULL;