Adapt to new Fuchsia target name

[flba-eb]

CI fails because there is no std lib available:

error: toolchain 'nightly-x86_64-unknown-linux-gnu' does not contain component 'rust-std' for target 'x86_64-fuchsia'

Availability monitor: https://rust-lang.github.io/rustup-components-history/

[flba-eb]

The failing test is not related to this change, see issue #511.

[JohnTitor]

Could we pin the nightly version for that target or use build-std instead?

[workingjubilee]

I agree: using cargo {command} -Zbuild-std is much more robust as a solution. It should still be removed eventually since we should be shipping a tier 2 target??? I don't know what's happening there.

Also this should be rebased on master just to make sure the CI run accurately reflects the current CI.

[workingjubilee]

Though also, hmmm.

I wonder, is rustbot functional on this repo? Because this should really be

@rustbot ping fuchsia

[rustbot]

Error: This repository is not enabled to use triagebot.
Add a triagebot.toml in the root of the default branch to enable it.

Please file an issue on GitHub at triagebot if there's a problem with this bot, or reach out on #t-infra on Zulip.

[workingjubilee]

RIP.

[JohnTitor]

Ah, I see!
rust-lang/rust#106429 renamed the target and the components are no longer shipped via that name.
Using x86_64-unknown-fuchsia should resolve the problem here.
(More info: rust-lang/rust#106636 re-added them to the supported targets, but it doesn't mean we can do rustup target add x86_64-fuchsia, it seems.)

[flba-eb]

CI for Fuchsia seems to work now 😃 , but not all tests have been run (because of #511).

[JohnTitor]

Let's fix other errors in another PR, thanks!