[MacPorts] #50765: stunnel @5.30_0: update to 5.31

[MacPorts]

#50765: stunnel @5.30_0: update to 5.31
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 Reporter:  mschamschula@…       |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.4
 Keywords:  haspatch maintainer  |       Port:  stunnel
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 stunnel has been updated to version 5.31. New this version:
 * New features
  - Added logging the list of client CAs requested by the server.
  - Improved compatibility with the current OpenSSL 1.1.0-dev tree.
 * Bugfixes
  - Only reset the watchdog if some data was actually transferred.

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Ticket URL: <https://trac.macports.org/ticket/50765>
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