Switch logging interface to accept fmt::Arguments. This means that we don't have to format arguments eagerly when logging; an implementation could choose to discard them if it wanted to, avoiding allocations and expensive format calls.

use libpam_sys_consts::pam_impl;

fn main() {
    println!("cargo:rustc-link-lib=pam");
    pam_impl::enable_pam_impl_cfg();
}