Function make_bindings_builder 

pub unsafe extern "C" fn make_bindings_builder(
    context: *mut c_context,
    state: *mut EvalState,
    capacity: usize,
) -> *mut BindingsBuilder

@brief Create a bindings builder @param[out] context Optional, stores error information @param[in] state nix evaluator state @param[in] capacity how many bindings you’ll add. Don’t exceed. @return bindings builder. Call nix_bindings_builder_free() when you’re done.