[MacPorts] #43514: Add "relative" variant to ruby21

[MacPorts]

#43514: Add "relative" variant to ruby21
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 Reporter:  kw@…                  |      Owner:  macports-tickets@…
     Type:  enhancement           |     Status:  new
 Priority:  Normal                |  Milestone:
Component:  ports                 |    Version:  2.2.1
 Keywords:  relative, app bundle  |       Port:  ruby21
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 To succesfully embed Ruby in a standard Mac app bundle, it needs to be
 compiled with the " --enable-load-relative" flag. This will allow the
 interpreter to load libraries relative to its installation. The attached
 patch to the ruby21 portfile adds the "relative" variant. I have
 successfully built and tested Ruby with this flag.

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Ticket URL: <https://trac.macports.org/ticket/43514>
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