ngircd: Disable "tcp wrappers", not available on OS X 10.8

Starting OS X 10.8, the "tcp wrappers" library is no longer part of
the operating system, so don't use it any more.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/ngircd.rb

@@ -13,7 +13,6 @@ class Ngircd < Formula
                           "--prefix=#{prefix}",
                           "--with-ident",
                           "--with-openssl",
-                          "--with-tcp-wrappers",
                           "--enable-ipv6"
     system "make install"
   end