gnu: Remove go-gopkg.in-tomb.v2.

* gnu/packages/golang.scm (go-gopkg.in-tomb.v2): Delete variable.

Change-Id: Icd42c56a36f8f6fa2888ef1f392f86e04bd5c26a

gnu/packages/golang.scm

@@ -1618,40 +1618,6 @@ management interface.  It can be used to monitor and control an OpenVPN process
 running with its management port enabled.")
       (license license:expat))))
 
-(define-public go-gopkg.in-tomb.v2
-  (let ((commit "d5d1b5820637886def9eef33e03a27a9f166942c")
-        (revision "0"))
-    (package
-      (name "go-gopkg.in-tomb.v2")
-      (version (string-append "0.0.0-" revision "." (string-take commit 7)))
-      (source (origin
-                (method git-fetch)
-                (uri (git-reference
-                      (url "https://github.com/go-tomb/tomb")
-                      (commit commit)))
-                (file-name (string-append name "-" version ".tar.gz"))
-                (sha256
-                 (base32
-                  "1sv15sri99szkdz1bkh0ir46w9n8prrwx5hfai13nrhkawfyfy10"))))
-      (build-system go-build-system)
-      (arguments
-       '(#:import-path "gopkg.in/tomb.v2"
-         #:phases
-         (modify-phases %standard-phases
-           (add-after 'unpack 'patch-source
-             (lambda _
-               ;; Add a missing % to fix the compilation of this test
-               (substitute* "src/gopkg.in/tomb.v2/tomb_test.go"
-                 (("t.Fatalf\\(`Killf\\(\"BO%s")
-                  "t.Fatalf(`Killf(\"BO%%s"))
-               #t)))))
-      (synopsis "@code{tomb} handles clean goroutine tracking and termination")
-      (description
-       "The @code{tomb} package handles clean goroutine tracking and
-termination.")
-      (home-page "https://gopkg.in/tomb.v2")
-      (license license:bsd-3))))
-
 (define-public go-gopkg-in-tomb-v1
   (package
     (name "go-gopkg-in-tomb-v1")