[MacPorts] #71324: legacysupport: provide support for FSEvents

[MacPorts]

#71324: legacysupport: provide support for FSEvents
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 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.10.4
 Keywords:                |       Port:  legacy-support
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 macOS < 10.7 do not support certain functionality with FSEvents, which is
 needed for a number of ports. Is it possible to supply those via `legacy-
 support`?
 Specifically, `kFSEventStreamCreateFlagFileEvents`,
 `kFSEventStreamEventFlagItemCreated ` and friends are missing:
 https://developer.apple.com/documentation/coreservices/1455376-fseventstreamcreateflags/kfseventstreamcreateflagfileevents
 etc.

 P. S. There is a related library, apparently working on 10.5+:
 https://github.com/malthe/macfsevents

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Ticket URL: <https://trac.macports.org/ticket/71324>
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