arch_rm_main no longer exists.

src/arch/i386/prefix/dskprefix.S

 	 * call will never return.
 	 */
 	movl	$exit_via_int19, %eax
-	pushl	$arch_rm_main
+	pushl	$arch_main
 	pushl	%eax		/* Dummy return address */
 
 	/* Do the equivalent of ljmp *%es:di */