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Start on support for aarch64

Dan Robertson requested to merge dlrobertson:aarch64 into master
  • Start aarch64 support
    • crt0 - add support to _start
    • platform - aarch64 does not have the open syscall. Instead most libc implementations use openat() with AT_FDCWD
  • Use sc instead of syscall. sc is the maintained fork of syscall.

I'd like to get this working on my rpi3. I still need to add support to the va_list crate for aarch64. Tests pass with all stdio stuff commented out.

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