[MacPorts] #41167: Add a +nowarnings variant to work around issues with the new compiler

[MacPorts]

#41167: Add a +nowarnings variant to work around issues with the new compiler
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  Reporter:  nomis52@…    |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.2.1
Resolution:               |   Keywords:  haspatch maintainer
      Port:  ola          |
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Comment (by nomis52@…):

 We want to detect potential bugs early. We took the decision as a project
 to fail on warnings so that we find out about the problem. It's been
 working well for us.

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Ticket URL: <https://trac.macports.org/ticket/41167#comment:2>
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