[MacPorts] #67874: mosquitto: update to 2.0.20

[MacPorts]

#67874: mosquitto: update to 2.0.20
------------------------+----------------------
  Reporter:  danh1979   |      Owner:  slewsys
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.10.5
Resolution:             |   Keywords:  haspatch
      Port:  mosquitto  |
------------------------+----------------------
Description changed by danh1979:

Old description:

> After some Internet-search-aided debugging, I found that I needed to:
> - add libcjson dependency
> - deal with missing symbols via the extra linker flag
> - deal with an xslt error by installing docbook XSL
>
> I tested a previous version of my patch to update to 2.0.16 on Ventura
> 13.5 on M2 Pro by creating my own local Portfile and installing it from
> source.
>
> Recently tested update to 2.0.20 on Sonoma 14.7.1 M2 Pro.
>
> Github merge request to follow

New description:

 After some Internet-search-aided debugging, I found that I needed to:
 - add libcjson dependency
 - deal with missing symbols via the extra linker flag
 - deal with an xslt error by installing docbook XSL

 I tested a previous version of my patch to update to 2.0.16 on Ventura
 13.5 on M2 Pro by creating my own local Portfile and installing it from
 source.

 Recently tested update to 2.0.20 on Sonoma 14.7.1 M2 Pro.

 Github merge request: https://github.com/macports/macports-
 ports/pull/26992

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Ticket URL: <https://trac.macports.org/ticket/67874#comment:9>
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