dev-ruby/power_assert: remove unused patch.

dev-ruby/power_assert/files/power_assert-0.2.6-ruby23-tests.patch

@@ -1,53 +0,0 @@
-From b1bf60605303a4d60fd398fb75e04e4ff1568b0d Mon Sep 17 00:00:00 2001
-From: Kazuki Tsujimoto <kazuki@callcc.net>
-Date: Sat, 26 Dec 2015 17:57:03 +0900
-Subject: [PATCH] Encoding::CompatibilityError is no longer raised as of ruby
- 2.3.0
-
----
- test/test_power_assert.rb | 31 +++++++++++--------------------
- 1 file changed, 11 insertions(+), 20 deletions(-)
-
-diff --git a/test/test_power_assert.rb b/test/test_power_assert.rb
-index 272b8d1..863f8cc 100644
---- a/test/test_power_assert.rb
-+++ b/test/test_power_assert.rb
-@@ -345,27 +345,18 @@ def test_inspection_failure
-       assertion_message { BasicObjectSubclass.new.foo }
- 
- 
--    verbose = $VERBOSE
--    default_external = Encoding.default_external
--    default_internal = Encoding.default_internal
--    begin
--      $VERBOSE = nil
--      Encoding.default_external = 'cp932'
--      Encoding.default_internal = 'utf-8'
--      ary = ["\u3042"]
--      assert_match Regexp.new(<<END.chomp.gsub('|', "\\|")), assertion_message {
--        ary.length
--        |   |
--        |   1
--        InspectionFailure: Encoding::CompatibilityError: .*
--END
--        ary.length
--      }
--    ensure
--      Encoding.default_internal = default_internal
--      Encoding.default_external = default_external
--      $VERBOSE = verbose
-+    o = Object.new
-+    def o.inspect
-+      raise
-     end
-+    assert_equal <<END.chomp.b, assertion_message {
-+      o.class
-+      | |
-+      | Object
-+      InspectionFailure: RuntimeError:
-+END
-+      o.class
-+    }
-   end
- 
-   def test_assertion_message_with_incompatible_encodings