Add catman, makewhatis functionality.  Print an error if the whatis database
is missing.

*** 12,30 ****
  #
  # Copyright 2012 Nexenta Systems, Inc. All rights reserved.
  #
  
  PROG=           man
! LINKS=          apropos whatis
  OBJS=           makewhatis.o man.o stringlist.o
  SRCS=           $(OBJS:%.o=%.c)
  
  include         $(SRC)/cmd/Makefile.cmd
  
  CFLAGS +=       $(CCVERBOSE)
  
! ROOTLINKS=      $(LINKS:%=$(ROOTBIN)/%)
  
  .KEEP_STATE :
  
  all:            $(PROG)
  
--- 12,31 ----
  #
  # Copyright 2012 Nexenta Systems, Inc. All rights reserved.
  #
  
  PROG=           man
! LINKS=          apropos whatis catman
! LIBLINKS =      makewhatis
  OBJS=           makewhatis.o man.o stringlist.o
  SRCS=           $(OBJS:%.o=%.c)
  
  include         $(SRC)/cmd/Makefile.cmd
  
  CFLAGS +=       $(CCVERBOSE)
  
! ROOTLINKS=      $(LINKS:%=$(ROOTBIN)/%) $(LIBLINKS:%=$(ROOTLIB)/%)
  
  .KEEP_STATE :
  
  all:            $(PROG)