Turns out that it is a bad idea to have a missing compat option be a

fatal condition.  While it works out really well for diagnosing the
case where you want it, but don't have it, it works really badly for
the case where you don't have it and don't want it.  Remove the printf
and exit pair.  Replate it with simple return to silently ignore this
condition.

This is needed to fix the COMPAT_IA32 being required in options.* in
stable, but we need to run this change through -current first...

MFC after:	3 days

usr.sbin/config/mkoptions.c

@@ -351,9 +351,11 @@ update_option(const char *this, char *val, int flags)
 			return;
 		}
 	}
-	fprintf(stderr, "Compat option %s not listed in options file.\n",
-	    this);
-	exit(1);
+	/*
+	 * Option not found, but that's OK, we just ignore it since it
+	 * may be for another arch.
+	 */
+	return;
 }
 
 static int