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

*** 29,39 ****
  include ../Makefile.cmd
  
  passwd := LDLIBS += $(ROOT)/usr/lib/passwdutil.so.1 
  lint := LDLIBS += -lpasswdutil
  LDFLAGS += $(ZIGNORE)
! LDLIBS += -lbsm -lpam -lnsl
  
  FILEMODE = 06555
  XGETFLAGS += -a -x $(PROG).xcl
  
  .KEEP_STATE:
--- 29,39 ----
  include ../Makefile.cmd
  
  passwd := LDLIBS += $(ROOT)/usr/lib/passwdutil.so.1 
  lint := LDLIBS += -lpasswdutil
  LDFLAGS += $(ZIGNORE)
! LDLIBS += -luserdefs -lbsm -lpam -lnsl
  
  FILEMODE = 06555
  XGETFLAGS += -a -x $(PROG).xcl
  
  .KEEP_STATE: