Avoid multiple redefinition of __init.

Index: lib/start.c
--- lib/start.c.orig
+++ lib/start.c
@@ -132,7 +132,7 @@ void __rstart (int argc, char *argv[])
 
   __roptions (argc, argv[1]);
 
-  __init ();
+  ___init ();
 
 /* SYSIN  :- new infile("...");   
  * SYSOUT :- new printfile("...");
