Add libuserdefs and use in cmd/{oamuser,passwd}

*** 53,69 ****
  
  CPPFLAGS=       -I$(HERE) -I$(LOCAL) $(CPPFLAGS.master)
  FILEMODE=       0555
  
  $(GROUPADD) :=  OBJS = $(ADD_OBJ)
! $(GROUPADD) :=  LDLIBS += $(LIBUSRGRP) -lcmdutils
  
  $(GROUPDEL) :=  OBJS = $(DEL_OBJ)
  $(GROUPDEL) :=  LDLIBS += $(LIBUSRGRP)
  
  $(GROUPMOD) :=  OBJS = $(MOD_OBJ)
! $(GROUPMOD) :=  LDLIBS += $(LIBUSRGRP)
  
  all:            $(PROG)
  
  $(PROG):        $$(OBJS) $(LIBUSRGRP)
          $(LINK.c) $(OBJS) -o $@ $(LDLIBS)
--- 53,69 ----
  
  CPPFLAGS=       -I$(HERE) -I$(LOCAL) $(CPPFLAGS.master)
  FILEMODE=       0555
  
  $(GROUPADD) :=  OBJS = $(ADD_OBJ)
! $(GROUPADD) :=  LDLIBS += $(LIBUSRGRP) -luserdefs -lcmdutils
  
  $(GROUPDEL) :=  OBJS = $(DEL_OBJ)
  $(GROUPDEL) :=  LDLIBS += $(LIBUSRGRP)
  
  $(GROUPMOD) :=  OBJS = $(MOD_OBJ)
! $(GROUPMOD) :=  LDLIBS += $(LIBUSRGRP) -luserdefs
  
  all:            $(PROG)
  
  $(PROG):        $$(OBJS) $(LIBUSRGRP)
          $(LINK.c) $(OBJS) -o $@ $(LDLIBS)