[MacPorts] #47064: Update port:rkward to version 0.6.3

[MacPorts]

#47064: Update port:rkward to version 0.6.3
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  Reporter:  thomas.friedrichsmeier@…  |      Owner:  mk@…
      Type:  submission                |     Status:  new
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:
Resolution:                            |   Keywords:
      Port:  rkward                    |
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Comment (by mk@…):

 We've got the same problem like last time:
 {{{
 Error: org.macports.activate for port rkward returned:
    Image error:
 /opt/local/Library/Frameworks/R.framework/Resources/library/rkward/CITATION
    already exists and does not belong to a registered port.
    Unable to activate port rkward. Use 'port -f activate rkward' to force
 the activation.
    DEBUG: Error code: registry::image-error
 }}}
 This is probably easily fixable by re-adding the pre-activate code, but
 I'll first try to investigate which files are on the buildbots ATM.

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Ticket URL: <https://trac.macports.org/ticket/47064#comment:9>
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