Ruby

test_io.rb: ignore not-implemented fadvice

• test/ruby/test_io.rb (test_advise_pipe): ignore not-implemented
  fadvice(2) when it is present but not implemented, as IO#advice
  does nothing and raises no exceptions. [Feature #11806]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53139 b2dd03c8-39d4-4d8f-98ff-823fe69b080e