Turn off `preadv()`, `readv()`, `pwritev()`, and `writev()` under WASI

[brettcannon]

Bug report

Bug description:

The POSIX functions preadv(), readv(), pwritev(), and writev() don't work as expected under WASI 0.2 on wasmtime. Since there are no plans to change that as their semantics are still POSIX-compliant, we should turn them off for WASI via https://github.com/python/cpython/blob/main/Tools/wasm/config.site-wasm32-wasi .

CPython versions tested on:

CPython main branch

Operating systems tested on:

Other

Linked PRs

• GH-115978: Disable *readv() and *writev() on WASI #116228
• [3.12] GH-115978: Disable *readv() and *writev() on WASI (GH-116228) #116231
• [3.11] GH-115978: Disable *readv() and *writev() on WASI (GH-116228) #116232