8411 Build should warn when linking against libraries outside proto area

@@ -22,10 +22,11 @@
 # Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 # Copyright 2016 Toomas Soome <tsoome@me.com>
 # Copyright 2016 Nexenta Systems, Inc.
+# Copyright 2017 RackTop Systems.
 #
 
 PROG= bootadm
 
 SBINLINKS= $(PROG)

@@ -43,10 +44,13 @@
 
 LDLIBS_i386= -lfdisk
 LDLIBS += -lficl-sys -lmd -lcryptoutil -lnvpair -lgen -ladm -lefi
 LDLIBS += -lz -lbe -lzfs -lofmt $(LDLIBS_$(MACH))
 
+# Allow zlib to be taken from outside the proto area.
+$(ADJUNCT_PROTO_NOT_SET)LDFLAGS += $(ZASSERTDEFLIB)=libz.so
+
 # Writing into string literals is incorrect.  We need to match gcc's
 # behavior, which causes us to take SIGSEGV on such a write.
 CFLAGS +=       $(XSTRCONST)
 CPPFLAGS +=     -D_FILE_OFFSET_BITS=64
 CPPFLAGS +=     -I$(SRC)/uts/common -I$(SRC)/common -I$(SRC)/common/ficl