buildroot: Fixing a perl warning

Installing this package should fix the following warning that
is displayed during builds:

dpkg-gencontrol: warning: File::FcntlLock not available; using flock which is not NFS-safe

Related to: https://github.com/KanoComputing/peldins/issues/820
versioning: Builds < 10 have 0 prepended

Because

`kano-settings_1.0-1.20140312build10` < `kano-settings_1.0-1.20140312build9`

Fixes #18