[MacPorts] #43339: Update arb to 6.0

[MacPorts]

#43339: Update arb to 6.0
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  Reporter:  matt.cottrell@…  |      Owner:  macports-tickets@…
      Type:  update           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.2.1
Resolution:                   |   Keywords:  haspatch maintainer
      Port:  arb              |
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Comment (by macsforever2000@…):

 The {{{compiler.blacklist *llvm-gcc-4.2}}} line should not be placed
 inside the {{{if {${configure.compiler} == "llvm-gcc-4.2"} }}} block. Just
 remove the {{{if}}} statement.

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Ticket URL: <https://trac.macports.org/ticket/43339#comment:3>
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