(Reuters) - Interserve said it had reached a deal with its lenders to defer a debt payment due early next year and was considering handing them its profitable building materials business RMDK as it works to avert a Carillion-style collapse."Interserve continues to be in constructive discussions with its lenders, who are fully supportive of Interserve's business plan and management team," the British construction and services company said in a statement on Friday. "The key commercial..