textproc/wordnet: fix newly-flagged compiler warnings

clang15 used by current is stricter -- probably, incorrectly so.
For example, -Wstrict-prototypes will now flag the following:

int fun(void);

...

int fun()
{
}

The definition must have an explicit "void"... There was also a
variable, which was set -- and even incremented -- but the of its
value was commented out in the upstream code decades ago. The
compiler now flags it -- correctly -- as set, but not used.