added ".ML" extension in "use" command

--- a/src/HOLCF/Fix.ML	Fri Sep 05 12:24:13 1997 +0200
+++ b/src/HOLCF/Fix.ML	Mon Sep 08 10:12:28 1997 +0200
@@ -913,7 +913,7 @@
 
 Addsimps adm_lemmas;
 
-use"adm";
+use"adm.ML";
 
 simpset := !simpset addSolver(fn thms =>
             (adm_tac (cut_facts_tac thms THEN' cont_tacRs)));