Add ObsoleteFiles.inc OLD_FILES entries for libnv

X-MFC with: r271241
Submitted by: pjd
Pointyhat to: ngie
Sponsored by: EMC / Isilon Storage Division


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272340 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f