Function nginx::BN_is_prime

pub unsafe extern "C" fn BN_is_prime(
    p: *const BIGNUM, 
    nchecks: c_int, 
    callback: Option<unsafe extern "C" fn(arg1: c_int, arg2: c_int, arg3: *mut c_void)>, 
    ctx: *mut BN_CTX, 
    cb_arg: *mut c_void
) -> c_int