[MacPorts] #38508: RFE: add version number support to `platforms` field in portfiles

[MacPorts]

#38508: RFE: add version number support to `platforms` field in portfiles
--------------------------+----------------------
  Reporter:  egall@…      |      Owner:  larryv@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.1.3
Resolution:               |   Keywords:
      Port:               |
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Comment (by larryv@…):

 Hm. It doesn’t seem that `platforms` even affects whether or not a port
 can be installed. Even after I change a port to use
 {{{
 platforms   freebsd
 }}}
 I can still install it on OS X. Can anyone confirm this behavior?

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Ticket URL: <https://trac.macports.org/ticket/38508#comment:3>
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