BOBBY CALDWELL, THE oft-sampled, blue-eyed soul singer behind the late Seventies smash “What You Won’t Do for Love,” has died at the age of 71. “Bobby passed away here at home,” Caldwell’s wife Mary tweeted Wednesday. “I held him tight in my arms as he left us. I am forever heartbroken. Thanks to all of you for your many prayers over the years.” While no cause of death was provided, Caldwell had struggled with health issues over the past six years, which Mary cited as a result of an adverse reaction to fluoroquinolone antibiotic. Caldwell was best known for his...