libs: update to jpnfs-0.5.9

Changelog for jpnfs-0.5.8..jpnfs-0.5.9
    * [5de9c4e] nfsv3: fix creation of symbolic link

Target: master
Require-book: no
Require-notes: no
Merge pull request #282 from kofemann/fix-nfs-2.6

libs: update to jpnfs-0.5.9