[MacPorts] #43339: Update arb to 6.0

[MacPorts]

#43339: Update arb to 6.0
---------------------------------+--------------------------------
 Reporter:  matt.cottrell@…      |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.2.1
 Keywords:  haspatch maintainer  |       Port:  arb
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 This update is arb 6.0.  The port now builds with clang and is compatible
 with Mavericks.

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Ticket URL: <https://trac.macports.org/ticket/43339>
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