update to the latest content of https://github.com/containers/podman/tree/v1.6.4-rhel

drop libseccomp dependency
Related: #2074089

update to the latest content of https://github.com/containers/podman/tree/v1.6.4-rhel
Related: #2074089

fix "podman can not create user inside of container"
Related: #1930552

fix "CVE-2021-20188 podman: container users permissions are not respected in privileged containers [rhel-7.9.z]"
Resolves: #1918282

fix podman-buildah mounting issue
Resolves: #1895027

fix "CVE-2020-14370 podman: environment variables leak between containers when started via Varlink or Docker-compatible REST API [rhel-7]"
Resolves: #1881062

use proper patch to address "podman does not use $TMPDIR loading a tar file."
Resolves: #1877699

fix "podman does not use $TMPDIR loading a tar file."
Resolves: #1877699

fix "CVE-2020-14040 podman: golang.org/x/text: possibility to trigger an infinite loop in encoding/unicode could lead to crash [rhel-7]"
Resolves: #1854715

revert regressions introduced by 0001-bump-github.com-containers-buildah-to-v1.11.5.patch
Related: #1817743, #1792243, #1784950

fix "podman launches a container with systemd instance inside - bind mounts of systemd cgroup entries are being leaked in host mount namespace"
Resolves: #1860506

rebuilt

fix "podman segfault upon doing buildah operations due to error handling message"
Resolves: #1853326

fix "CVE-2020-8945 proglottis/gpgme: Use-after-free in GPGME bindings during container image pull"
Resolves: #1806940

fix "CVE-2020-10696 buildah: crafted input tar file may lead to local file overwriting during image build process"
Resolves: #1817743