ngircd: update to v21.1

- update to v21.1
- upstream introduced a getaddrinfo check that is not working
  when cross compiling
- this upstream commit b8433e9261c516d7b8743b33681050b6666192e5
  is reverted because OpenWrt does not have anything to do with AIX
  and it's broken implementation

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>