normal 46ad38a44d drb: avoid redundant fcntl call
Sockets are close-on-exec by default since Ruby 2.0, so it
is redundant to set it again.

* lib/drb/drb.rb (set_sockopt): remove redundant fcntl call
* lib/drb/unix.rb (set_sockopt): ditto
  [ruby-core:69128] [Feature #11137]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50645 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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..
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