[MacPorts] #68877: cgal5: mark noarch

[MacPorts]

#68877: cgal5: mark noarch
-------------------------+----------------------
 Reporter:  jmroot       |      Owner:  Veence
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  cgal5
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 It looks like this port only installs headers, so it could set
 `supported_archs noarch` and `platforms any`.

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Ticket URL: <https://trac.macports.org/ticket/68877>
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