add ncursesw shared lib, to test properly

tools like nano and vim build fine with it,
add -DUSE_WIDECHAR to CFLAGS to include ncursesw.h
automatically when <ncurses.h> is used

Change-Id: I7bfacc4d812fdf2d69ab65a4c645af0e792ea34c
Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>