[Pkg-rust-maintainers] Directly bootstrapping arm architectures

[Ximin Luo]

Instead of building a cross-compiler, we can directly bootstrap arm64,armel,armhf using the 1.9.0 binaries provided by Rust upstream. We can bundle these into the orig-dl tarball as we did for amd64,i386 in previous versions. After the initial versions are uploaded, we can drop the orig-dl for the next version.

I'm building this right now on asachi (arm64 porterbox) and the build is going well.

Unless anyone complains, I'm going to proceed with this once the build succeeds and I'm happy with the results. I know that bootstrapping via cross-compilation is "cleaner" from a Debian perspective, but it would take much much more work. :( (And there are plenty of other architectures to try this with, in the future!)

X

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