add arm64 (aka aarch64) platform

[SJLC]

Started from amd64 table, then updated table (removed unsupported,
updated numbers) based on syscall list extracted from aarch64 kernel:
https://github.com/hrw/syscalls-table

There were a couple differences in naming conventions from that used here:
uname -> newuname
fstat -> newfstat

That syscall list includes a few more syscalls (pkey_alloc, pkey_free,
pkey_mprotect) that could be added later for all 3 platforms...

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[SJLC]

I have to submit my phone number to google in order to contribute to kafel?

[robertswiecki]

IANAL, though would it be possible to provide any phone number that can be potentially used to contact you (to satisfy this CLA requirement)? Otherwise, I'll have to figure out whether this can be dropped from 'required fields' possibly for all projects, which might take time and with not of a big chance to succeed IMO.

PS: I really appreciate your PR

[SJLC]

It would be good at least ask if it can be dropped it from required, probably I'm not the only one who wants to be contacted by email rather than phone...
but I did fill it out rather than making things difficult for you. Thanks for maintaining this project.

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and have the pull request author add another comment and the bot will run again.

[SJLC]

my co-author filled out the CLA as well now

[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

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[rlc2]

I'm the other commit author and it's ok to use my contributions.

[robertswiecki]

Thanks! Seems all contributors confirmed. Awesome.