Unresolved import `nix::fcntl` in WASI

I get the following error:
```rs
error[E0432]: unresolved import `nix::fcntl`
 --> src/lib.rs:7:10
  |
7 | use nix::fcntl::{flock, FlockArg};
  |          ^^^^^ could not find `fcntl` in `nix`
  ```
  When I try to compile with `cargo build --target wasm32-wasi`