Add RISC-V support

[Amanieu]

The vendored capstone is updated to include capstone-engine/capstone#1682.

[Amanieu]

CI failure seems to be unrelated, the same error happens on master.

[tmfink]

Thanks for the PR, this looks really great!

My only request is that you add some unit tests, which will increase confidence (especially when we make subsequent upgrades to the bundled capstone). I suggest convert several of the instructions from capstone-sys/capstone/tests/test_riscv.c.

As an example, take a look at capstone-rs/src/test.rs tests test_arch_mips()/test_arch_mips_detail().

[Amanieu]

I did add tests: https://github.com/capstone-rust/capstone-rs/pull/100/files#diff-a1c12c7efdc33c34fd3c1e0d29eec806c2444907eb898f64356208960fbae58f

[tmfink]

I did add tests: https://github.com/capstone-rust/capstone-rs/pull/100/files#diff-a1c12c7efdc33c34fd3c1e0d29eec806c2444907eb898f64356208960fbae58f

Sorry--don't know how I missed that. Thanks for the contribution!

[Amanieu]

Could you publish a new version with this change?

[Amanieu]

Ping for publishing a new release.

[tmfink]

I published version 0.9.0.