* process.c (check_exec_redirect): Open the file in write mode for
  redirect from [:out, :err].
  Proposed and implemented by Yusuke Endoh.
  [ruby-dev:41430] [Feature #3348]



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45828 b2dd03c8-39d4-4d8f-98ff-823fe69b080e