font: rules outside any section can be applied multiple times

This is for backward compatibility (for font descriptions generated by
older versions of Neatmkfn).

font.c

@@ -204,10 +204,10 @@ static void font_performgpos(struct font *fn, int *src, int slen,
  while (1) {
  int r = font_findrule(fn, 0, 0, src + i, slen - i,
  src + i, i, &idx);
- if (r < 0)  /* no rule found */
+ if (r < 0) /* no rule found */
  break;
- if (gpos[r].sec == lastsec) /* perform at most one rule from each lookup */
- continue;
+ if (gpos[r].sec > 0 && gpos[r].sec == lastsec)
+ continue; /* perform at most one rule from each lookup */
  lastsec = gpos[r].sec;
  pats = gpos[r].pats;
  for (k = 0; k < gpos[r].len; k++) {