gnu: Remove ruby-minitest-4.

* gnu/packages/ruby.scm (ruby-minitest-4): Delete variable.

No package relies on this package anymore.

Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>

gnu/packages/ruby.scm

@@ -5925,39 +5925,6 @@ default (and first) theme.  It's what you get when you run @code{jekyll new}.")
 facilities supporting TDD, BDD, mocking, and benchmarking.")
     (license license:expat)))
 
-;; This is the last release of Minitest 4, which is used by some packages.
-(define-public ruby-minitest-4
-  (package
-    (inherit ruby-minitest)
-    (version "4.7.5")
-    (source (origin
-              (method url-fetch)
-              (uri (rubygems-uri "minitest" version))
-              (sha256
-               (base32
-                "03p6iban9gcpcflzp4z901s1hgj9369p6515h967ny6hlqhcf2iy"))))
-    (arguments
-     (list
-      #:phases
-      #~(modify-phases %standard-phases
-          (add-after 'unpack 'remove-unsupported-method
-            (lambda _
-              (substitute* "Rakefile"
-                (("self\\.rubyforge_name = .*") ""))))
-          (add-after 'build 'patch-tests
-            (lambda _
-              ;; test_no_method_error_on_unexpected_methods
-              ;; This test fails due to some extra information in the message
-              (substitute* "test/minitest/test_minitest_mock.rb"
-                (("assert_equal expected, e.message")
-                 "assert_equal expected, e.message.lines.first.strip"))
-              ;; Some tests are failing on Ruby 2.4 due to the deprecation of
-              ;; Fixnum.
-              (delete-file "test/minitest/test_minitest_spec.rb"))))))
-    (native-inputs
-     (list ruby-minitest
-           ruby-hoe))))
-
 (define-public ruby-minitest-around
   (package
     (name "ruby-minitest-around")