Disable preadv(), readv(), pwritev(), and writev() on WASI.
Under wasmtime for WASI 0.2, these functions don't pass test_posix (bytecodealliance/wasmtime#7830).
Disable preadv(), readv(), pwritev(), and writev() on WASI.
Under wasmtime for WASI 0.2, these functions don't pass test_posix (bytecodealliance/wasmtime#7830).