scripts/lxdialog: find ncurses even in Multi-arch

Adapt 'find' command so that it not only searches in the directories given,
but also in the directories one level below, allowing to find the ncurses
library even in installations where ncurses is already Multi-Arch-ified.

scripts/lxdialog/Makefile

@@ -31,7 +31,7 @@ all: ncurses lxdialog
 lxdialog: $(OBJS)
 
 ncurses:
-	@x=`find /lib/ /usr/lib/ /usr/local/lib/ -maxdepth 1 -name 'libncurses.*'` ;\
+	@x=`find /lib/ /usr/lib/ /usr/local/lib/ -maxdepth 2 -name 'libncurses.*'` ;\
 	if [ ! "$$x" ]; then \
 		/bin/echo -e "\007" ;\
 		echo ">> Unable to find the Ncurses libraries." ;\