[MacPorts] #57021: mesa: please update to 18.1.6

[MacPorts]

#57021: mesa: please update to 18.1.6
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  Reporter:  pmetzger  |      Owner:  jeremyhu
      Type:  update    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  mesa      |
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Comment (by pmetzger):

 Sadly, I think as a pragmatic matter, assigning this to Jeremy when he's
 too busy to get to it soon may be a mistake.

 We may need a small group of volunteers to get the X and related stuff up
 to snuff again while he's away.

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Ticket URL: <https://trac.macports.org/ticket/57021#comment:2>
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