Renamed duplicate test

Import rubygems/rubygems#2678

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67205 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/rubygems/test_gem_specification.rb

@@ -1675,7 +1675,7 @@ dependencies: []
     assert_equal expected, err
   end
 
-  def test_contains_requirable_file_eh_extension
+  def test_contains_requirable_file_eh_extension_java_platform
     ext_spec(platform: Gem::Platform.new("java"))
 
     _, err = capture_io do