Function arduino_esp::qsort_r

pub unsafe extern "C" fn qsort_r(
    __base: *mut c_void, 
    __nmemb: usize, 
    __size: usize, 
    _compar: Option<unsafe extern "C" fn(_: *const c_void, _: *const c_void, _: *mut c_void) -> c_int>, 
    __thunk: *mut c_void
)