8411 Build should warn when linking against libraries outside proto area

*** 20,29 ****
--- 20,30 ----
  #
  #
  # Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  # Copyright 2016 Igor Kozhukhov <ikozhukhov@gmail.com>
  # Copyright (c) 2011, 2016 by Delphix. All rights reserved.
+ # Copyright 2017 RackTop Systems.
  #
  
  LIBRARY= libzfs.a
  VERS= .1
  
*** 75,84 ****
--- 76,88 ----
  $(NOT_RELEASE_BUILD)CPPFLAGS += -DDEBUG
  
  # There's no lint library for zlib, so only include this when building
  $(DYNLIB) := LDLIBS +=  -lz
  
+ # Allow zlib to be taken from outside the proto area.
+ $(ADJUNCT_PROTO_NOT_SET)DYNFLAGS += $(ZASSERTDEFLIB)=libz.so
+ 
  LINTFLAGS +=    -erroff=E_STATIC_UNUSED
  LINTFLAGS64 +=  -erroff=E_STATIC_UNUSED
  
  SRCS=   $(OBJS_COMMON:%.o=$(SRCDIR)/%.c)        \
          $(OBJS_SHARED:%.o=$(SRC)/common/zfs/%.c)