[MacPorts] #44523: Upgrade arb 6.0 -> 6.0.1

[MacPorts]

#44523: Upgrade arb 6.0 -> 6.0.1
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  Reporter:  matt.cottrell@…  |      Owner:  ryandesign@…
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.3.1
Resolution:                   |   Keywords:  maintainer haspatch
      Port:  arb              |
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Comment (by ryandesign@…):

 You've added a block preventing the port from building on Mac OS X 10.6 or
 earlier. Why? The comment above that block refers to #33756, but that
 ticket was resolved 2 years ago and doesn't appear to relate (that ticket
 discusses crashes in a version of clang that was never shipped on 10.6).

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Ticket URL: <https://trac.macports.org/ticket/44523#comment:6>
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