The incompatibilty between systemd and CONFIG_AUDIT has been fixed since
Linux kernel 3.14, thus there is no reason to disable it on LFS. And we
are referring to pam_loginuid.so from /etc/pam.d in BLFS, which is
completely useless if CONFIG_AUDIT is disabled.
Link: https://github.com/systemd/systemd/commit/db999e0f923c
Import kernel-config infrastructure from BLFS and use it for kernel
configuration. Note that kernel-config.py is slightly different from
BLFS: we need role="nodump" for <screen> here.
