* Updated the `OpenSSL::OPENSSL_VERSION_NUMBER` comment explaining the format.
* Added the `OpenSSL::LIBRESSL_VERSION_NUMBER` to print LibreSSL version number,
in the case that Ruby OpenSSL binding is compiled with LibreSSL. Note
`test/openssl/utils.rb#libressl?` is not using this value in it for now.
* Update `rake debug` to print the values in a readable way, adding
`OpenSSL::OPENSSL_VERSION_NUMBER` and `OpenSSL::LIBRESSL_VERSION_NUMBER`.
https://github.com/ruby/openssl/commit/d19e6360ed
f1df062944