K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2021-09-20T00:33:43.892857Z
K 7
svn:log
V 602
bsd.lib.mk: add conditions for building _pie.a archives

As with other .a targets, build _pie.a archives only if LIB is set.

At present we build _pie.a only for INTERNALLIBs, and none of them
include bsd.lib.mk without setting LIB.  However, we might want to build
_pie.a for non-INTERNALLIBs in the future.

Reviewed by:	arichardson
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D31920

(cherry picked from commit 7c0226cad3f36a05832f9c5216dfa3dadb91c92d)

Git Hash:   95ea87898f2365015e1a8473e5c50e5126844648
Git Author: emaste@FreeBSD.org
END