makefile: avoid repetition, reuse elapsed target

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/Makefile

@@ -672,7 +672,7 @@ finish: $(LOG_DIR)/6_report.log \
         $(RESULTS_DIR)/6_final.v \
         $(RESULTS_DIR)/6_final.sdc \
         $(GDS_FINAL_FILE)
-	-@$(UTILS_DIR)/genElapsedTime.py -d "$(LOG_DIR)"
+	$(UNSET_AND_MAKE) elapsed
 
 .PHONY:
 elapsed: