* ext/io/console/console.c: delete redefinition of rb_cloexec_open.
  This function is always defined by io.c and is declared as non-static
  in a header file, so this declaration causes a compilation error.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42466 b2dd03c8-39d4-4d8f-98ff-823fe69b080e