Reimplement use of "config_readline.h" to get readline configuration.

cmd-line-utils/readline/bind.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/callback.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/compat.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/complete.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/display.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/funmap.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/histexpand.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/histfile.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/history.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/histsearch.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/input.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/isearch.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/keymaps.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/kill.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/macro.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/mbutil.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/misc.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/nls.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/parens.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/readline.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/rltty.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/savestring.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/search.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/shell.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/signals.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/terminal.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/text.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/tilde.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/undo.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/util.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/vi_mode.c:
  Include local config_readline.h instead of config.h
cmd-line-utils/readline/xmalloc.c:
  Include local config_readline.h instead of config.h