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

[MacPorts]

#44523: Upgrade arb 6.0 -> 6.0.1
---------------------------------+--------------------------------
 Reporter:  matt.cottrell@…      |      Owner:  macports-tickets@…
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.1
 Keywords:  maintainer haspatch  |       Port:  arb
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 This patch resolves several outstanding issues with the arb port and
 brings it up to the latest version released by the upstream developers.

 Addresses the problem building arb on Lion
 [https://trac.macports.org/ticket/44368].

 Addresses problems detecting the compiler on older versions of OS X
 [https://trac.macports.org/ticket/44367]

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