Now keyword parameter warnings are suppressed by 871005bdd2

This reverts commits:

* 2a490d5660
  Suppress assert_match warnings.

* d4a86e407e
  Assert warnings message for the last argument is keyword parameter.

test/rubygems/test_require.rb

@@ -524,11 +524,11 @@ class TestGemRequire < Gem::TestCase
         _, err = capture_subprocess_io do
           system(@@ruby, "-w", "-rpp", "--disable=gems", "-I", lib, "-C", dir, "-I.", "main.rb")
         end
-        assert_match(/main.rb:1: warning: The last argument is used as the keyword parameter/, err)
+        assert_equal "{:x=>1}\n{:y=>2}\n", err
         _, err = capture_subprocess_io do
           system(@@ruby, "-w", "-rpp", "--enable=gems", "-I", lib, "-C", dir, "-I.", "main.rb")
         end
-        assert_match(/main.rb:1: warning: The last argument is used as the keyword parameter/, err)
+        assert_equal "{:x=>1}\n{:y=>2}\n", err
       end
     end
   end