Derive copyright year from src/COPYRIGHT.

MFC after:	2 weeks


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274458 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
add support for private knote lock (reduces lock contention),
adapting OS_selrecord accordingly.
Problem and fix suggested by adrian and jmg


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274459 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f