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

[MacPorts]

#60315: Integrate port_binary_distributable.tcl into base
--------------------------+-----------------------------
  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 mascguy):

 Dan OKed me taking over the work. So I created a new PR, with changes
 requested by reviewers:

 [https://github.com/macports/macports-base/pull/240 PR 240 - add
 licensecheck target, copied from macports-infrastructure; updated work
 from defunct PR #211]

 Corresponding changes for the ports repo, is encompassed by this PR:

 [https://github.com/macports/macports-ports/pull/11033 PR 11033 - macports
 base support: add licenses for new licensecheck target; update bash
 completions]

-- 
Ticket URL: <https://trac.macports.org/ticket/60315#comment:7>
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