Use partial SHA1 instead of full platform name and Cabal version on Windows#1027

Merged

snoyberg merged 1 commit intocommercialhaskell:masterfrom

anton-dessiatov:shorten-dist

Sep 27, 2015

Commits on Sep 22, 2015

Replace full platform name and cabal version in build artifact path on Windows with first 8 symbols of its SHA1 hash. This is done to decrease chances of hitting 260 symbol path limit.
anton-dessiatov
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