K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2017-07-24T15:39:09.655686Z
K 7
svn:log
V 342
lld 5.0 supports filter libraries, so enable linker feature flag

Also switch the logic to enable this for any non-lld linker, since
filter library support is fairly simple and is very likely supported
by any other linker capable of linking the FreeBSD base system.

MFC after:	2 months
MFC with:	r321369
Sponsored by:	The FreeBSD Foundation

END