8411 Build should warn when linking against libraries outside proto area

*** 21,30 ****
--- 21,32 ----
  #
  #
  # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  #
+ # Copyright 2017 RackTop Systems.
+ #
  
  PROG=           availdevs
  
  include ../Makefile.cmd
  
*** 38,47 ****
--- 40,52 ----
  #
  LDLIBS += -lzfs_jni -lnvpair -lzfs
  all install := LDLIBS += -lxml2
  LINTFLAGS += -xerroff=E_NAME_USED_NOT_DEF2
  
+ # Allow libxml2 to be taken from outside the proto area.
+ $(ADJUNCT_PROTO_NOT_SET)LDFLAGS += $(ZASSERTDEFLIB)=libxml2.so
+ 
  CPPFLAGS += $(INCS) -D_LARGEFILE64_SOURCE=1 -D_REENTRANT
  $(NOT_RELEASE_BUILD) CPPFLAGS += -DDEBUG
  
  .KEEP_STATE: