A Cook County jury has awarded about $4.1 million to a man who was severely injured after falling 20 feet through a hole at a Chicago Transit Authority construction site on the Brown Line. The award would have been higher — about $7.5 million — but jurors found the plaintiff, James Glenn, nearly half at fault for the accident. Glenn was working as a flagger for the CTA at its Southport Avenue station on a walkway at track level on Feb. 15, 2008. Glenn’s job was to stop the trains so that …