Add android_riscv64 to BUILD.bazel

[prashanthswami]

Downstream projects that process the Bazel file were failing as the recent introduction of the 'android_riscv64' target did not have a corresponding config_setting.

[prashanthswami]

For review: @malfet (please let me know if there's a more reasonable way of requesting reviews, I'm not familiar with how to do so other then '@'-ing you on each PR.

FYI: @davidben

[malfet]

@prashanthswami can you please mention what downstream dependencies you are referring to?
And what is the current plan for the repo releases? I.e. I assumed almost nobody should rely on trunk, but rather on tagged versions

[prashanthswami]

I'll have to take a closer look internally, but in this particular case, it was XNNPACK (https://github.com/google/XNNPACK). As some folks were pulling that library they were also implicitly pulling in a new version of cpuinfo. Their build system was Bazel, so they got caught on my error when processing the file.

I guess to that point - you mention that we should be relying on tagged versions, but there's no tags or releases on this project, are there? When I look at the main page of this repo, I only see 1 branch - 0 tags - no releases.

[malfet]

@prashanthswami are you on PyTorch slack? Let's discuss how this project can go forward, as I don't think I have a bandwidth to be a dedicated reviewer of all the PRs that might come, and I would appreciate help setting up CI so that one does not need to ask for reformatting changes all the time

[prashanthswami]

I am not! But I have just now made a request for access.

[malfet]

@prashanthswami hmm, I don't see it yet. Should I send an invitation to an email from this PR?

[prashanthswami]

Yes, that would be great - for reference in case I filled out the wrong link, I used this form from the Pytorch dev site: https://docs.google.com/forms/d/e/1FAIpQLSeADnUNW36fjKjYzyHDOzEB_abKQE9b6gqqW9NXse6O0MWh0A/viewform

[prashanthswami]

Following up here - I noticed that I didn't get an email confirming that I submitted an invitation request, so I redid it. This time I got one, so perhaps I missed hitting submit? (Or maybe didn't flag 'send me a copy of responses').