Request to change ruby default version to 2.5

[Walter Schwarzenfeld]

After this change:

|portmaster -R -r ruby-2.5|

|
===>>> Port directory: /usr/ports/databases/ruby-bdb

     ===>>> This port is marked BROKEN
     ===>>> does not build with Ruby 2.5


     ===>>> If you are sure you can build it, remove the
            BROKEN line in the Makefile and try again.

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