[MacPorts] #61888: openssh-8.4p1 dropped support for launchd in ssh-agent

[MacPorts]

#61888: openssh-8.4p1 dropped support for launchd in ssh-agent
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 Reporter:  wcn3    |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
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 Looking at the description of https://github.com/macports/macports-
 ports/commit/03c756a541a6e97dee5f2352129b5cd0b3108b67 it intended to drop
 support for a number of Apple-specific features that were now part of the
 upstream, but the launchd support for ssh-agent was also removed. The
 launchd functionality is not present upstream, and this makes ssh-agent no
 longer work correctly when started from launchd, which is necessary to
 work around the default ssh-agent in Catalina and above.

 I've tested out a patch that restores this functionality.

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Ticket URL: <https://trac.macports.org/ticket/61888>
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