Rollup merge of #127280 - ferrocene:hoverbear/disable-rmake-rustdoc-io-error, r=jieyouxu

Disable rmake test rustdoc-io-error on riscv64gc-gnu

In https://github.com/rust-lang/rust/pull/126917 we disabled `inaccessible-temp-dir` on `riscv64gc-gnu` because the container runs the build as `root` (just like the `armhf-gnu` builds). Tests creating an inaccessible test directory are not possible, since `root` can always touch those directories.

https://github.com/rust-lang/rust/blob/553a69030e5a086eb3841d020db8c9c463948c72/src/ci/docker/host-x86_64/disabled/riscv64gc-gnu/Dockerfile#L99

This means the tests are run as `root`. As `root`, it's perfectly normal and reasonable to violate permission checks this way:

```bash
$ sudo mkdir scratch
$ sudo chmod o-w scratch
$ sudo mkdir scratch/backs
$
```

Because of this, this PR makes the test ignored on `riscv64gc` (just like on `armhf-gnu`) for now.

As an alternative, I believe the best long-term strategy would be to not run the tests as `root` for this job. Some preliminary exploration was done in https://github.com/rust-lang/rust/pull/126917#issuecomment-2189933970, however that appears a larger lift.

## Testing

> [!NOTE]
> `riscv64gc-unknown-linux-gnu` is a [**Tier 2 with Host Tools** platform](https://doc.rust-lang.org/beta/rustc/platform-support.html), all tests may not necessarily pass! This change should only ignore `inaccessible-temp-dir` and not affect other tests.

You can test out the job locally:

```sh
DEPLOY=1 ./src/ci/docker/run.sh riscv64gc-gnu
```

r? `@jieyouxu`

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