[MacPorts] #57539: legacysupport-1.0: Let ports specify what symbols they need

[MacPorts]

#57539: legacysupport-1.0: Let ports specify what symbols they need
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  Reporter:  ryandesign     |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:
      Port:  legacysupport  |
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Comment (by cjones051073):

 I only added {{{legacysupport.newest_darwin_requires_legacy}}} to act in
 corner cases where it is really needed. The majority of ports only need to
 add the PortGroup and that is it, nothing else, and I was aiming at
 keeping it simple like that. Requiring that ports that use it also have to
 list the specific functions they are going to use just seems like over
 engineering things a bit, to me.

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Ticket URL: <https://trac.macports.org/ticket/57539#comment:7>
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