dg-extract-results.sh: Only handle WARNING: program timed out lines specially in "$MODE" == "sum".

	* dg-extract-results.sh: Only handle WARNING: program timed out
	lines specially in "$MODE" == "sum".  Restore previous behavior
	for "$MODE" != "sum".  Clear has_timeout and timeout_cnt if in
	a different variant or curfile is empty.
	* dg-extract-results.py: Fix a typo.

From-SVN: r270415