Adapt to @WhatIsGcc@ being renamed to @CC@ in GHC HEAD
Adapt to @WhatIsGcc@ being renamed to @CC@ in GHC HEAD

sdiehl/ghc,sdiehl/ghc,izgzhen/hadrian,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,snowleopard/shaking-up-ghc,snowleopard/hadrian,sdiehl/ghc,sdiehl/ghc,bgamari/shaking-up-ghc