Build touchy and unlit only in Stage0, copy binaries for later stages (#693)
Build touchy and unlit only in Stage0, copy binaries for later stages (#693)

* unlit: build only in stage0, copy that binary for later stages (fixes #595)

* add missing condition

We only want this "optimisation" for unlit.

* compare 'Package's instead of strings

* same optimisation for touchy

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