Fixing more TTY/term warning/prototype craziness.

Fixing more TTY/term warning/prototype craziness.

	* src/ui/TTY/redisplay-tty.c: Include term.h if available.
	Define prototypes for tgetent, tgetflag, tgetnum, tgetstr, tputs
	if not available.

	* configure.ac (CURSES_H_FILE): No default in variable expansion.
	(TERMCAP_H_FILE): Ditto.
	(TERM_H_FILE): Ditto.
	(HAVE_TPARM_PROTOTYPE): Add 'checking' message.
	(HAVE_TGETENT_PROTOTYPE): Check if tgetent prototype is available.
	(HAVE_TGETFLAG_PROTOTYPE): Check if tgetflag prototype is available.
	(HAVE_TGETNUM_PROTOTYPE): Check if tgetnum prototype is available.
	(HAVE_TGETSTR_PROTOTYPE): Check if tgetstr prototype is available.
	(HAVE_TPUTS_PROTOTYPE): Check if tputs prototype is available

Signed-off-by: Nelson Ferreira <nelson.ferreira@ieee.org>