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Thomas Miedema authored
We only support building GHC on mys2 nowadays, see https://ghc.haskell.org/trac/ghc/wiki/Building/Preparation/Windows. This (partially) reverts various commits from a few years ago, among which: * 5775d514 "Add OSTYPE build-system variable, and use it" * 3fb8c431 "Fix building libgmp on cygwin" * cdbb4720 "Fix cmd invocation by libffi cuild system on Windows 7 cygwin" * e8121501 "Fix dblatex and xml* tool detection on Windows" Reviewed by: austin, Phyx Differential Revision: https://phabricator.haskell.org/D1155
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