* lib/securerandom.rb: use OpenSSL::BN for performance improvement.

* benchmark/bm_securerandom.rb: benchmark script.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47104 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* properties.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47105 b2dd03c8-39d4-4d8f-98ff-823fe69b080e