Revision 565450

net/libdnet: disable useless buildtime check for /dev/bpf presence

Device is not guarateed to exist at package building time.

PR:		238523
Submitted by:	rea@FreeBSD.org
Reported by:	dweimer@dweimer.net
Approved by:	maintainer timeout (onatan@gmail.com, 1.5 years)
MFH:		2021Q1