allow static_claus on static clauses wo source

C/cdmgr.c

@@ -3631,7 +3631,7 @@ static Int fetch_next_static_clause(PredEntry *pe, yamop *i_code, Term th,
      don't do this!! I might have stored a choice-point and changed ASP
      Yap_RecoverSlots(3);
   */
-  if (cl == NULL || !(pe->PredFlags & SourcePredFlag)) {
+  if (cl == NULL) {
     UNLOCKPE(45, pe);
     return false;
   }

pl/debug.yap

@@ -572,7 +572,7 @@ be lost.
 	*->
 	'$stop_creeping'(_),
     (
-	'$continue_debugging_goal'(yes, '$execute_clause'(G, M, R, CP))
+	'$creep'('$execute_clause'(G, M, R, CP), M)
      ;
      InRedo = true
     )