hadrian: Remove RTS -Waggregate-return warning
hadrian: Remove RTS -Waggregate-return warning

This was removed from make in 077b92fa39839a8e83cd87398435424403cf6486
sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc