[MacPorts] #46956: base should keep track of explicitly requested variants on install and only preserve those on upgrade

[MacPorts]

#46956: base should keep track of explicitly requested variants on install and only
preserve those on upgrade
--------------------------+----------------------------
  Reporter:  neverpanic   |      Owner:  neverpanic
      Type:  enhancement  |     Status:  accepted
  Priority:  Normal       |  Milestone:  MacPorts 2.7.0
 Component:  base         |    Version:  2.3.3
Resolution:               |   Keywords:
      Port:               |
--------------------------+----------------------------
Changes (by mojca):

 * milestone:  MacPorts 2.6.0 => MacPorts 2.7.0


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Ticket URL: <https://trac.macports.org/ticket/46956#comment:9>
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