Port to GNU/Linux systems with tinfo but not ncurses.
* configure.ac (USE_NCURSES): New symbol. * src/dispnew.c (init_display): Depend on USE_NCURSES, not GNU_LINUX, to decide whether ncurses is being used. Without this change, GCC complains about tgetent not being declared, on a system that has tinfo installed but ncurses not installed.
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