Rollup merge of #110587 - tomaka:fix-109727, r=jyn514

Fix `std` compilation error for wasi+atomics

Fix https://github.com/rust-lang/rust/issues/109727

It seems that the `unsupported/once.rs` module isn't meant to exist at the same time as the `futex` module, as they have conflicting definitions.

I've solved this by defining the `once` module only if `not(target_feature = "atomics")`.
The `wasm32-unknown-unknown` target [similarly only defines the `once` module if `not(target_feature = "atomics")`](https://github.com/tomaka/rust/blob/01c4f319276da912dd2be768ae0ce9857ad6bb63/library/std/src/sys/wasm/mod.rs#L69-L70).

As show in [this block of code](https://github.com/tomaka/rust/blob/01c4f319276da912dd2be768ae0ce9857ad6bb63/library/std/src/sys_common/once/mod.rs#L10-L34), the `sys::once` module doesn't need to exist if `all(target_arch = "wasm32", target_feature = "atomics")`.

0 files changed, 0 insertions, 0 deletions