Function libgit2_sys::git_cred_ssh_custom_new

pub unsafe extern "C" fn git_cred_ssh_custom_new(
    out: *mut *mut git_cred,
    username: *const c_char,
    publickey: *const c_char,
    publickey_len: size_t,
    sign_callback: git_cred_sign_callback,
    payload: *mut c_void
) -> c_int