io.c: clear Strings we create for IO.copy_stream

While we can't recycle strings after giving them rb_funcall*,
we can reduce their malloc overhead by resizing them to zero.
This only affects cases where either `src' or `dst' is a non-IO
object and either `copy_length' is passed or there is
pre-existing data in the read buffer.

* io.c (copy_stream_fallback_body): clear when done with `copy_length'
  (copy_stream_body): clear when done with pre-existing read buffer

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61632 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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