drawChar is overloaded in FontSJIS. One takes a "Surface &" as first
parameter another one "void *", they furthermore have the exact same
number of required parameters. The one "void *" just had a few extra
parameters with default values. This resulted in a bug in SCUMM, where
"VirtScreen *" (a subclass of Surface) was passed instead of "VirtScreen &"
and thus the method taking "void *" was incorrectly used.
To make it easier to spot such bugs in the future I just removed the default
values and thus disallow such calls.
933ee5b156