[Patch]: comment defines

[walter harms]

The code contains two undocumented defines
add short description for these.

Signed-off-by: wharms <wharms at bfs.de>
---

--- ftpd.c.org	2012-06-17 23:23:25.000000000 +0200
+++ ftpd.c	2012-06-17 23:24:09.000000000 +0200
@@ -28,6 +28,11 @@
 //usage:     "\n	-t,-T	Idle and absolute timeouts"
 //usage:     "\n	DIR	Change root to this directory"

+/*
+ IF_WE_WANT_TO_REQUIRE_LOGIN         - Enable login
+ WHY_BOTHER_WE_CAN_ASSUME_IP_MATCHES - verify that PORT's IP matches getpeername().
+*/
+
 #include "libbb.h"
 #include <syslog.h>
 #include <netinet/tcp.h>