package/tpm2-tss: override auto-detection of groupadd and systemd

tpm2-tss is looking for systemd_sysusers and systemd_tmpfiles, but those
two are not mandatory. However, it might find those from the host.

But that is not an issue in the end, because they are only used to
instanciate the users and create the tmpfiles. At build time on the
host, we do not need them, and on the target, if systemd is being used,
then they will be instanciated/created at boot.

If they are not found, then the fallback paths are taken, and those
fallback paths are those using the setfacl and groupadd and useradd
tools, which we already know are going to fail but that we do not care.

So, we can safely force those two to =no to avoid the install trying to
use the system-wide tools, or even the ones we build as part of
host-systemd ourselves.

Eventually, when systemd-tmpfiles of systemd-sysusers are missing, the
fallback paths use useradd, and configure unconditionally checks for
it, so as for groupadd and setfacl in commits d9123dd7
(package/tpm2-tss: fix build on host without setfacl) and c8f847c4
(package/tpm2-tss: fix build on host without groupadd), we just fake the
detection of groupadd.

Fixes:
 - http://autobuild.buildroot.org/results//97bfa8f7dcb12e36bd63c9d06fb39418070d840b



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>