[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
Resolution:                   |   Keywords:  haspatch maintainer
      Port:  arb              |
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Comment (by matt.cottrell@…):

 Replying to [comment:5 macsforever2000@…]:
 > Note these issues:
 >
 > {{{
 > $ port lint --nitpick
 > --->  Verifying Portfile for arb
 > Error: Unknown dependency: glib
 > Warning: no license set
 > --->  1 errors and 1 warnings found.
 > }}}
 >

 Portfile now includes license info.  The unknown dependency issue is
 resolved as well.

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Ticket URL: <https://trac.macports.org/ticket/43339#comment:6>
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