Add 64-bit RISC-V support

[felixonmars]

Tested with orjson and it built fine with all tests passed on a
riscv64 machine.

This change is not sufficient though, because ring doesn't support
riscv64 yet. I was building maturin against a custom version of ring
to verify this change.

Please let me know what could be done to move forward :)

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[messense]

Thanks, please run cargo fmt.

[messense]

I'll fix the code format issue after merging.

[felixonmars]

I'll fix the code format issue after merging.

Thanks! I was about to do it :P

[messense]

Since ring doesn't support RISC-V yet, we should also add it to

maturin/setup.py

Lines 49 to 52 in 1339808

	if platform.machine() in ("ppc64le", "ppc64", "powerpc") or (
	sys.platform == "win32" and platform.machine() == "ARM64"
	):
	cargo_args.extend(["--no-default-features", "--features=upload,log,human-panic"])

@felixonmars do you know what does platform.machine() return on 64-bit RISC-V?

[felixonmars]

what does platform.machine() return on 64-bit RISC-V?

>>> platform.machine()
'riscv64'

[messense]

Released in v0.13.1.