Remove convenience list macros from isc/util.h

The short convenience list macros were used very sparingly and
inconsistenly in the code base.  As the consistency is prefered over
the convenience, all shortened list macro were removed in favor of
their ISC_LIST API targets.

lib/ns/hooks.c

@@ -48,7 +48,7 @@ struct ns_plugin {
 	ns_plugin_check_t *check_func;
 	ns_plugin_register_t *register_func;
 	ns_plugin_destroy_t *destroy_func;
-	LINK(ns_plugin_t) link;
+	ISC_LINK(ns_plugin_t) link;
 };
 
 static ns_hooklist_t default_hooktable[NS_HOOKPOINTS_COUNT];