[MacPorts] #62598: cjdns @21.1 "-march=native" not supported on Apple M1

[MacPorts]

#62598: cjdns @21.1 "-march=native" not supported on Apple M1
--------------------------+--------------------
  Reporter:  eric-j-ason  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.4
Resolution:               |   Keywords:  arm64
      Port:  cjdns        |
--------------------------+--------------------

Comment (by kencu):

 https://developer.apple.com/forums/thread/672654

 I would think it would be better for clang to just eat that flag and
 ignore it on arm, rather than error, but it would seem upstream felt
 otherwise...

 another layer of complexity now to everything, to never pass that flag if
 arm is in the build architectures.... sigh.

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Ticket URL: <https://trac.macports.org/ticket/62598#comment:1>
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