Use libruby instead of libopenssl-ruby on Lucid

See:

    ubuntu@ip-10-235-39-170:~$ sudo apt-get install libopenssl-ruby
    Reading package lists... Done
    Building dependency tree
    Reading state information... Done
    Note, selecting 'libruby' instead of 'libopenssl-ruby'
    libruby is already the newest version.
    0 upgraded, 0 newly installed, 0 to remove and 35 not upgraded.