search for ncurses headers in default cygwin location

scripts/scan-tools.sh

@@ -184,9 +184,11 @@ fi
 
 if [[ ! -s /usr/include/ncurses.h ]]; then
 	if [[ ! -s /usr/include/curses.h ]]; then
-		echo Install ncurses header files, please.
-		echo
-		out=1
+		if [[ ! -s /usr/include/ncurses/ncurses.h ]]; then
+			echo Install ncurses header files, please.
+			echo
+			out=1
+		fi
 	fi
 fi