Function libssh2_sys::libssh2_userauth_publickey_fromfile_ex

pub unsafe extern fn libssh2_userauth_publickey_fromfile_ex(sess: *mut LIBSSH2_SESSION,
                                                            username: *const c_char,
                                                            username_len: c_uint,
                                                            publickey: *const c_char,
                                                            privatekey: *const c_char,
                                                            passphrase: *const c_char)
                                                            -> c_int