[MacPorts] #55574: mkvtoolnix: Disable update checker

[MacPorts]

#55574: mkvtoolnix: Disable update checker
--------------------+------------------------
 Reporter:  mf2k    |      Owner:  ryandesign
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  mkvtoolnix
--------------------+------------------------
 When I launch mkvtoolnix-gui from the command line, it checks for an
 update. This should be disabled.

 {{{
 $ mkvtoolnix-gui
 libpng warning: iCCP: known incorrect sRGB profile
 [...]
 Creating checker
 UpdateChecker::start: initiating requests
 UpdateChecker::start: checkStarted emitted
 UpdateChecker::start: URL list built
 UpdateChecker::start: startup done
 NetworkAccessManager::startDownload: token 0 starting for url
 QUrl("https://mkvtoolnix.download/latest-release.xml.gz")
 NetworkAccessManager::manager: creating QNetworkAccessManager
 qt.network.ssl: Error receiving trust for a CA certificate

 }}}

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Ticket URL: <https://trac.macports.org/ticket/55574>
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