[MacPorts] #51706: platform statement: support an else clause

[MacPorts]

#51706: platform statement: support an else clause
--------------------------+--------------------------------
  Reporter:  RJVB         |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:  haspatch
      Port:               |
--------------------------+--------------------------------
Changes (by RJVB):

 * Attachment "patch-platform-command.2.diff" added.


-- 
Ticket URL: <https://trac.macports.org/ticket/51706>
MacPorts <https://www.macports.org/>
Ports system for macOS