lib:util: Disable logging to syslog for startup messages

lib:util: Disable logging to syslog for startup messages

D_ERR also is sent to syslog!

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15869

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Wed Jun 18 12:10:03 UTC 2025 on atb-devel-224

(cherry picked from commit 58c64ba25adb1c1d272ba196529b5465ae7ee9df)

Autobuild-User(v4-22-test): Jule Anger <janger@samba.org>
Autobuild-Date(v4-22-test): Thu Jun 26 14:33:11 UTC 2025 on atb-devel-224