Refactor the Argon2 tests to enable the module build and integrate the tests into function_test. Signed-off-by: Gary Lin <glin@suse.com> Tested-By: Waldemar Brodkorb <wbx@openadk.org> Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>