Merge audit.c:1.41, audit_arg.c:1.19, audit_bsm.c:1.26,
audit_bsm_klib.c:1.15, audit_bsm_token.c:1.15, audit_pipe.c:1.15,
audit_syscalls.c:1.26, audit_trigger.c:1.8, audit_worker.c:1.23
from HEAD to RELENG_7:

Use __FBSDID() for $FreeBSD$ IDs in the audit code.