Want Windows ARM binary release

[gdamore]

On Apple Silicon, its nicer to run Windows in a VM using native ARM cpu support (Aarch64) instead of x86 emulation.

I suspect I'm not alone in wanting to install a binary (because building LDC is no fun, especially if you have to boot strap LLVM first), on Parallels running on my recent macbook.

(Windows running here is to verify that my code works in Windows).

It would be very nice to have Windows ARM pre-built ... btw, this is not something I can get with DMD (as you are no doubt aware, since DMD cannot generate ARM binaries.)

[kinke]

I've tried to add the package in #4931, but hit a blocker while trying to link ldc2.exe (using the prebuilt LLVM from https://github.com/ldc-developers/llvm-project/releases/tag/ldc-v20.1.5). And I'm pretty sure we'd hit failures in the testsuite once we get past that linker error...