Ruby » Ruby master

io.c: use read/write methods if possible

• io.c (copy_stream_body): use the arguments without conversion if
  having read, readpartial, and write methods, than conversion by
  to_path method. [ruby-core:68676] [Bug #11015]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50118 b2dd03c8-39d4-4d8f-98ff-823fe69b080e