Crosscompiling for OpenBSD arm64

Following on from OpenBSD/arm64 on QEMU, it's not always practical to compile userland software or a new kernel on some systems, particularly small SoCs with limited space and memory - or indeed QEMU, in fear of melting your CPU.

There are two scenarios here - the first, if you are looking for a standard cross-compiler for Aarch64, and the second if you want an OpenBSD-specific environment.

Daniel Nechtan

Exactly what it says on the tin.