Cast `libc::STDIN_FILENO` to `RawFd`.
Cast `libc::STDIN_FILENO` to `RawFd`.

WASI's `RawFd` is a `u32`, while `libc` uses `c_int`.

aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust