[MacPorts] #47227: fix nits reported by ryan schmidt

[MacPorts]

#47227: fix nits reported by ryan schmidt
---------------------------------+--------------------------------
 Reporter:  lists@…              |      Owner:  macports-tickets@…
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.3
 Keywords:  haspatch maintainer  |       Port:  hub
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 - removed destroot.args
 - clear build.target target without {}
 - removed unneeded build depend

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Ticket URL: <https://trac.macports.org/ticket/47227>
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