K 10
svn:author
V 3
mat
K 8
svn:date
V 27
2016-10-12T12:19:55.327991Z
K 7
svn:log
V 279
Change the way opt_USE is parsed.

This makes it possible to have:
opt_USE=  ldconfig=${PREFIX}/lib/foo/bar

Before this, it would have ended up doing USE_LDCONFIG=/lib/foo/bar,
without ${PREFIX}.

Sponsored by:	Absolight
Differential Revision:	https://reviews.freebsd.org/D8169

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