curses and ncurses

[Sven Hartrumpf <Sven.Hartrumpf@FernUni-Hagen.de>]

Just in case anybody else faces an error during plt/install like this (which
is caused by having ncurses but not curses installed under Linux):

make: making compiled/native/i386-linux/mzrl.so because compiled/native/i386-linux/mzrl.so does not exist
link-extension: (/usr/bin/ld -shared -L/usr/lib -lreadline -lcurses compiled/native/i386-linux/mzrl.o /tmp/linux/drscheme-cvs/plt/lib/mzdyn.o -o compiled/native/i386-linux/mzrl.so)
/usr/bin/ld: cannot find -lcurses
make: Failed to make compiled/native/i386-linux/mzrl.so; link-extension: command failed

Solution: change -lcurses to -lncurses in collects/readline/mzmake.ss

Greetings
Sven