[MacPorts] #66050: p7zip does not install when building for 10.12 SDK due to missing Corefoundation.h

[MacPorts]

#66050: p7zip does not install when building for 10.12 SDK due to missing
Corefoundation.h
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 Reporter:  lukaso  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
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 In relation to figuring out what was going wrong with lzma
 (https://trac.macports.org/ticket/66039), I have tried to build the same
 locally.

 This build is under rosetta `arch -x86_64 zsh` and in a local directory.

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Ticket URL: <https://trac.macports.org/ticket/66050>
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