Accept T15828 test output
Accept T15828 test output

This test output changed slightly due to commit
2257a86daa72db382eb927df12a718669d5491f8 (which is expected).

sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc