[bug#34523] Add tetrinet

[<pkill9@runbox.com>]

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Tetrinet is a multiplayer tetris game. There are two versions: a command line implementation and a GTK implementation - this package is the command line implementation. http://tetrinet.or.cz/

The license is written in the README as

```
Distribution/license information
--------------------------------
This program is public domain, and may be modified and distributed without
limitation.
```

So I don't know what license to put it as, so I set it as 'expat'.

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From 1e36c7b0cafac68dcac43bfe301ae979ced67800 Mon Sep 17 00:00:00 2001
From: Pkill -9 <pkill9@runbox.com>
Date: Mon, 18 Feb 2019 06:52:14 +0000
Subject: [PATCH] gnu: Add tetrinet.

* gnu/packages/games.scm (tetrinet): New variable.
---
 gnu/packages/games.scm | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/gnu/packages/games.scm b/gnu/packages/games.scm
index f82af0e8c..5a83efcc2 100644
--- a/gnu/packages/games.scm
+++ b/gnu/packages/games.scm
@@ -36,6 +36,7 @@
 ;;; Copyright © 2018 Madalin Ionel-Patrascu <madalinionel.patrascu@mdc-berlin.de>
 ;;; Copyright © 2018 Benjamin Slade <slade@jnanam.net>
 ;;; Copyright © 2018 Alex Vong <alexvong1995@gmail.com>
+;;; Copyright © 2019 Pkill -9 <pkill9@runbox.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -6102,3 +6103,36 @@ to download and install them in @file{$HOME/.stepmania-X.Y/Songs} directory.")
     (home-page "https://www.stepmania.com")
     (license license:expat)))
 
+(define-public tetrinet
+  (package
+    (name "tetrinet")
+    (version "0.11")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "http://tetrinet.or.cz/download/tetrinet-"
+             version
+             ".tar.bz2"))
+       (sha256
+        (base32
+         "0b4pddqz6is1771qmvcj8qqlr4in2djdbkk13agvp9yhfah2v8x7"))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("ncurses" ,ncurses)))
+    (arguments
+     `(#:tests? #f ; No tests.
+       #:make-flags '("CC=gcc")
+       #:phases (modify-phases %standard-phases
+                  (delete 'configure)
+                  (add-after 'unpack 'fix-install-dir
+                    (lambda* (#:key outputs #:allow-other-keys)
+                      (let ((out (assoc-ref outputs "out")))
+                        (mkdir-p (string-append out "/bin"))
+                        (substitute* "Makefile"
+                          (("/usr/games") (string-append out "/bin")))))))))
+    (home-page "http://tetrinet.or.cz")
+    (synopsis "Multiplayer tetris")
+    (description "Tetrinet is a multiplayer tetris game with powerups and
+attacks you can use on opponents.")
+    (license license:expat)))
-- 
2.20.1