arm64/CROSS_COMPILE: use aarch64-linux-gnu- when aarch64-none-elf- is missing
This makes using Archlinux, Debian, and others less of a chore, as we won't need to set CROSS_COMPILE anymore.
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This makes using Archlinux, Debian, and others less of a chore, as we won't need to set CROSS_COMPILE anymore.