Add bindings for custom error definition

    unsafe extern "C" fn(buf: *mut c_char, size: c_int, rwflag: c_int, user_data: *mut c_void)

        -> c_int;

#[repr(C)]

pub struct ERR_STRING_DATA {

    pub error: c_ulong,

    pub string: *const c_char,

}

pub type SHA_LONG = c_uint;

pub type SHA_LONG64 = u64;

    pub fn ERR_clear_error();

    pub fn ERR_put_error(lib: c_int, func: c_int, reason: c_int, file: *const c_char, line: c_int);

    pub fn ERR_set_error_data(data: *mut c_char, flags: c_int);

    #[cfg(ossl110)]

    pub fn ERR_load_strings(lib: c_int, str: *mut ERR_STRING_DATA) -> c_int;

    #[cfg(not(ossl110))]

    pub fn ERR_load_strings(lib: c_int, str: *mut ERR_STRING_DATA);

    pub fn ERR_get_next_error_library() -> c_int;

    pub fn EVP_md5() -> *const EVP_MD;

    pub fn EVP_ripemd160() -> *const EVP_MD;

    pub fn SSL_CTX_set_psk_server_callback(

        ssl: *mut SSL_CTX,

        psk_server_cb: Option<

            extern "C" fn(*mut SSL, *const c_char, *mut c_uchar, c_uint)

                -> c_uint,

            extern "C" fn(*mut SSL, *const c_char, *mut c_uchar, c_uint) -> c_uint,

        >,

    );