[MacPorts] #57021: mesa: please update to 18.2.1

[MacPorts]

#57021: mesa: please update to 18.2.1
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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 Lord-Kamina):

 I have made an updated Portfile for mesa 19.2.3; however, from seeing some
 other issues (#54643, #54638) it seems evident there was a real effort
 made to keep mesa building as far back as possible and my version would
 most likely break all of that.

 What should I do?

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Ticket URL: <https://trac.macports.org/ticket/57021#comment:7>
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