[MacPorts] #48448: stunnel @5.20_0: update to 5.21

[MacPorts]

#48448: stunnel @5.20_0: update to 5.21
---------------------------------+--------------------------------
 Reporter:  mschamschula@…       |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.3
 Keywords:  haspatch maintainer  |       Port:  stunnel
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 stunnel has been updated to version 5.21: urgency: MEDIUM
 * New features
  - Signal names are displayed instead of numbers.
  - First resolve IPv4 addresses on passive resolver requests.
  - The "make check" target was modified to only build Win32
    executables when stunnel is built from a git repository
  - More elaborate descriptions were added to the warning about
    using "verify = 2" without "checkHost" or "checkIP".
  - Performance optimization was performed on the debug code.
 * Bugfixes
  - Fixed the FORK and UCONTEXT threading support.
  - Fixed "failover=prio" (broken since stunnel 5.15).
  - Added a retry when sleep(3) was interrupted by a signal
    in the cron thread scheduler.

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Ticket URL: <https://trac.macports.org/ticket/48448>
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