drop CVE-2021-3621.patch
refresh a few patches
fixup configure-unsafe globally via sed in build.m4
=== test
RESULTS - sssd.SSSDTest.test_sssd_help: PASSED (1.70s)
RESULTS - sssd.SSSDTest.test_sssd_sssctl_conf_perms_chk: PASSED (2.71s)
RESULTS - sssd.SSSDTest.test_sssd_sssctl_deamon: PASSED (2.07s)
Signed-off-by: Armin Kuster <akuster808@gmail.com>