util/crypto/libcrypto: changed sss_hmac_sha1()
Implementation of sss_hmac_sha1() was changed (again) to support
broader range of OpenSSL versions.
Resolves: https://pagure.io/SSSD/sssd/issue/4026
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>