bindgen output

Bindgen generates this struct:

#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct pthread_mutex_t {
    pub value: ::std::os::raw::c_int,
}

That's valid and it works, but everytime I want to use
this `pthread_mutex_t` type with `libc::pthread_mutex_lock()`
I have to cast it into `libc::pthread_mutex_t`:

let libc_mutex_ptr = &mut bindgen_mutex as *mut _ as *mut libc::pthread_mutex_t;

This kind of cast happens all over my code. Is there a way to either:

1) make it so bindgen re-use libc::pthread_mutex_t instead of creating its own,
2) or, have an elegant way to cast from bindgen mutex to libc mutex?