[MacPorts] #42862: base: add os.minor global var

[MacPorts]

#42862: base: add os.minor global var
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 Reporter:  ionic@…     |      Owner:  macports-tickets@…
     Type:  submission  |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  base        |    Version:
 Keywords:  haspatch    |       Port:
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 os.version is already being split up into os.major, but os.minor has been
 left out for some reason.

 At the time of writing, those ports could make use of os.minor:
 aqua/qt4-mac
 devel/libnotify
 (multimedia/ffmpeg
 multimedia/ffmpeg-devel) < submission pending for those.

 Add os.minor.

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Ticket URL: <https://trac.macports.org/ticket/42862>
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