Larn 12.0 portablitity bug

[Kurt Staiger]

FIONREAD is included in two spots in tok.c.  The simplest hack is to comment out
the ioctl and ic checking in both locations and insert "fflush(stdin);" in the 
flushall subroutine.  Essentially, this restores the typeahead problem because
no checking is done but the game will compile and run under SysV.

P.S. The "#include <stdio.h>" line has to be put in tok.c as well. Note this is
not an "official" fix just a suggestion.