The women of “The Devil Wears Prada 2 ” are clacking their stilettos all the way to the bank.  As the sequel to the iconic fashion film continues to rake in cash across the globe — $300 million in box office and counting — multiple sources told Variety what the triumvirate of leading ladies earned to return after 20 years. Streep, who stars again as the fearsome magazine editor Miranda Priestly, was obviously the most crucial element for filmmakers and distributor 20th Century Studios. They came to the table with an offer befitting Streep’s pedigree and enduring market value, four sources said. While Streep could have commanded far more to don Priestly’s silver bob a second time, the sources said the 21-time Oscar nominee fetched $12.5 million for the David Frankel-directed sequel.…