9852 enable ld(1) guidance and deflib assertions for the illumos build

*** 44,59 ****
  LDLIBS +=       -lofmt -linetutil -lipadm -lnvpair
  LINTFLAGS +=    -m
  
  ROOTUSRSBINLINKS = $(PROG:%=$(ROOTUSRSBIN)/%)
  
! # ipadm uses the ancillary data feature which is available only through
! # UNIX 98 standards version of Socket interface. This interface is supposed to
! # be accessed by -lxnet. In addition -lsocket is used to capture new
! # not-yet-standard interfaces. Someday -lxnet alone should be enough when IPv6
! # inspired new interfaces are part of standards.
! LDLIBS +=       -lxnet -lsocket
  
  # these #defines are required to use UNIX 98 interfaces
  _D_UNIX98_EXTN= -D_XOPEN_SOURCE=500 -D__EXTENSIONS__
  
  $(OBJS)         := CPPFLAGS +=  $(_D_UNIX98_EXTN)
--- 44,54 ----
  LDLIBS +=       -lofmt -linetutil -lipadm -lnvpair
  LINTFLAGS +=    -m
  
  ROOTUSRSBINLINKS = $(PROG:%=$(ROOTUSRSBIN)/%)
  
! LDLIBS +=       -lxnet
  
  # these #defines are required to use UNIX 98 interfaces
  _D_UNIX98_EXTN= -D_XOPEN_SOURCE=500 -D__EXTENSIONS__
  
  $(OBJS)         := CPPFLAGS +=  $(_D_UNIX98_EXTN)