Hadrian: Bump Shake to 0.17.6
Hadrian: Bump Shake to 0.17.6

The new release of Shake comes with these relevant features:

* use symlinks for --shared
* add --compact for a Bazel/Buck style output

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