[MacPorts] #60315: Integrate port_binary_distributable.tcl into base

[MacPorts]

#60315: Integrate port_binary_distributable.tcl into base
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  Reporter:  ryandesign   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:  MacPorts Future
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 We could then use that functionality in several ways. For example,
 MacPorts could avoid trying to download a binary for ports known in
 advance not to be distributable. (This should be configurable in
 macports.conf; we do want to download binaries of nondistributable ports
 from a private server when using Travis CI for example.) Or reclaim could
 be enhanced so that it does not uninstall build dependencies of ports
 known not to be distributable (#60754).

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Ticket URL: <https://trac.macports.org/ticket/60315#comment:1>
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