* configure.ac: Make ncurses checking to set $LIBS and check the ncursesw lib  
          actually works before defaulting to it over ncurses!  Shock!  



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4567 35c25a1d-7b9e-4130-9fde-d3aeb78583b8