[MacPorts] #70642: Add llvm-mingw project

[MacPorts]

#70642: Add llvm-mingw project
-------------------------+-----------------------------
 Reporter:  MaddTheSane  |      Owner:  (none)
     Type:  request      |     Status:  new
 Priority:  Normal       |  Milestone:  MacPorts Future
Component:  ports        |    Version:
 Keywords:               |       Port:
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 The current mingw provided by `mingw-w64` only targets x86_64 and i386
 variants of Windows, whereas llvm-mingw targets x86_64 and i386 as well as
 ARMv7 and AARCH64.

 The project can be found here: https://github.com/mstorsjo/llvm-mingw

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Ticket URL: <https://trac.macports.org/ticket/70642>
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