Fix `%nonassoc and eof'.

Fix `%nonassoc and eof'.
* src/state.c (errs_dup): Aaaah!  The failure was due to bytes
which were not properly copied!  Replace
memcpy (res->errs, src->errs, src->nerrs);
with
memcpy (res->errs, src->errs, src->nerrs * sizeof (src->errs[0]));
!!!
* tests/regression.at (%nonassoc and eof): Adjust to newest
Autotest: `.' is not in the PATH.