[MacPorts] #59218: QLMarkdown and QLColorcode fail on Catalina 10.15

[MacPorts]

#59218: QLMarkdown and QLColorcode fail on Catalina 10.15
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 Reporter:  breiter             |      Owner:  (none)
     Type:  defect              |     Status:  new
 Priority:  Normal              |  Milestone:
Component:  ports               |    Version:
 Keywords:  QuickLook Catalina  |       Port:
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 Quicklook generators installed by MacPorts do not function properly in
 Catalina 10.15.0. I have built MacPorts from source on Catalina and
 reinstalled all of my ports.

 Unfortunately, the QuickLook generators -- QLMarkdown and QLColorCode --
 build and install but they don't work. Instead of generating quickook
 previews macOS generates an error that the preview cannot be safely
 displayed.

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Ticket URL: <https://trac.macports.org/ticket/59218>
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