merge revision(s) 42709: [Backport #10529]

	* io.c (copy_stream_body): should write in binary mode.  based on a
	  patch by godfat (Lin Jen-Shin) at [ruby-core:56556].
	  [ruby-core:56518] [Bug #8767]

	* io.c (copy_stream_body): move common open flags.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@48631 b2dd03c8-39d4-4d8f-98ff-823fe69b080e