pkgbase: Remove vital flags for FreeBSD-utilities

Per the pkg-descr: "Non-vital programs and librairies"

Reviewed by: emaste
MFC after: 2 weeks
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D33436

(cherry picked from commit 3ea43eff0554aad3f1c973d9078549e625168908)