- update to 2.1.21
    - turn off compilation of libsasl v1 (finally)
    - explicitly disable sqlite to avoid the build warning
    - change the default mechanism which is set for saslauthd from "shadow" to
        "pam" (#159194)
    - split the shared library up from saslauthd so that multilib systems don't
        have to pull in every dependency of saslauthd for the compat arch
        (#166749)