12312 fix unused lib dependencies

*** 20,30 ****
  #
  #
  # Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  # Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
! # Copyright (c) 2018, Joyent, Inc.
  #
  
  PROG    = dhcpagent
  ROOTFS_PROG = $(PROG)
  DEFAULTFILES = dhcpagent.dfl
--- 20,30 ----
  #
  #
  # Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  # Use is subject to license terms.
  # Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
! # Copyright 2020 Joyent, Inc.
  #
  
  PROG    = dhcpagent
  ROOTFS_PROG = $(PROG)
  DEFAULTFILES = dhcpagent.dfl
*** 44,54 ****
  
  # not linted
  SMATCH=off
  CPPFLAGS  += -D_XOPEN_SOURCE=500 -D__EXTENSIONS__
  LDLIBS    += -lxnet -lnvpair -ldhcpagent -ldhcputil -linetutil -ldevinfo \
!         -ldlpi -lresolv -lsocket -lipadm
  
  # Disable warnings that affect all XPG applications.
  LINTFLAGS += -erroff=E_INCONS_ARG_DECL2 -erroff=E_INCONS_VAL_TYPE_DECL2
  
  .KEEP_STATE:
--- 44,54 ----
  
  # not linted
  SMATCH=off
  CPPFLAGS  += -D_XOPEN_SOURCE=500 -D__EXTENSIONS__
  LDLIBS    += -lxnet -lnvpair -ldhcpagent -ldhcputil -linetutil -ldevinfo \
!         -ldlpi -lresolv -lipadm
  
  # Disable warnings that affect all XPG applications.
  LINTFLAGS += -erroff=E_INCONS_ARG_DECL2 -erroff=E_INCONS_VAL_TYPE_DECL2
  
  .KEEP_STATE: