Fix: position() after skip() did not report correct position.

src/support/ios.c

@@ -470,6 +470,7 @@ off_t ios_skip(ios_t *s, off_t offs)
  off_t fdpos = lseek(s->fd, offs, SEEK_CUR);
  if (fdpos == (off_t)-1)
  return fdpos;
+ s->fpos = fdpos;
  s->bpos = s->size = 0;
  s->_eof = 0;
  }