inetutils: Add patch for Canadian TLD server

Cherry-picked from upstream (inetutils-1_9_4-31-g73e2811).

Could be a long time before a new inetutils release is made.
vcunat amended the patch to apply.

pkgs/tools/networking/inetutils/default.nix

@@ -8,6 +8,8 @@ stdenv.mkDerivation rec {
     sha256 = "05n65k4ixl85dc6rxc51b1b732gnmm8xnqi424dy9f1nz7ppb3xy";
   };
 
+  patches = [ ./whois-Update-Canadian-TLD-server.patch ];
+
   buildInputs = [ ncurses /* for `talk' */ perl /* for `whois' */ ];
 
   configureFlags = "--with-ncurses-include-dir=${ncurses.dev}/include";

pkgs/tools/networking/inetutils/whois-Update-Canadian-TLD-server.patch

@@ -0,0 +1,27 @@
+From 73e2811a0512556fd5359acc4387f46c79a9884a Mon Sep 17 00:00:00 2001
+From: Mats Erik Andersson <gnu@gisladisker.se>
+Date: Thu, 2 Mar 2017 15:38:38 +0100
+Subject: [PATCH] whois: Update Canadian TLD server.
+Content-Type: text/plain; charset=utf-8
+
+---
+ ChangeLog           | 8 ++++++++ (OMITTED)
+ whois/tld_serv_list | 2 +-
+ 2 files changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/whois/tld_serv_list b/whois/tld_serv_list
+index 056efcf..91697b8 100644
+--- a/whois/tld_serv_list
++++ b/whois/tld_serv_list
+@@ -81,7 +81,7 @@
+ #.bw			# NIC? www.botsnet.bw
+ #.by	NONE		# NIC? http://unibel.by www.open.by
+ .bz	NONE		# http://www.psg.com/dns/bz/
+-.ca	whois.cdnnet.ca
++.ca	whois.cira.ca
+ .cc	whois.nic.cc
+ .cd	WEB http://www.nic.cd/database/cd/
+ #.cf	NONE		# NIC? http://www.socatel.intnet.cf
+-- 
+2.10.0
+