Individual sdist-foo targets
Individual sdist-foo targets

so that one can build a source distribution without downloading the
windows tarballs.

(cherry picked from commit 50e4d40f88c3eee41384efacfd83f73305e2210d)

lukexi/ghc-7.8-arm64,lukexi/ghc-7.8-arm64,hferreiro/replay,lukexi/ghc-7.8-arm64,hferreiro/replay,hferreiro/replay,hferreiro/replay,hferreiro/replay,hferreiro/replay,lukexi/ghc-7.8-arm64,hferreiro/replay,lukexi/ghc-7.8-arm64