prototype change in openssl bundled with newer OpenBSD.
  a patch from Takahiro Kambe <taca at back-street.net> in
  [ruby-dev:34691].


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@16467 b2dd03c8-39d4-4d8f-98ff-823fe69b080e