fixes bug on macppc/cats due to unsigned char (EOF check is -1)
Instead, fix the typo that accidentally caused multiline constants to be created.
Submitted by Jose Nazario <jose@crimelabs.net>. Zoom is a Z-Machine, which means that it plays text adventure games written in ZCode. The original games were written by a company called 'Infocom' in the 80's. It is designed to run under X11.