Remove 'cpp-options: -DWIN32' from 'cabal-install.cabal'.
Remove 'cpp-options: -DWIN32' from 'cabal-install.cabal'.

It's unneeded. C files use 'defined(_WIN32)' and Haskell files use
'mingw32_HOST_OS'.

kolmodin/cabal,headprogrammingczar/cabal,garetxe/cabal,gbaz/cabal,bennofs/cabal,themoritz/cabal,bennofs/cabal,sopvop/cabal,sopvop/cabal,Heather/cabal,headprogrammingczar/cabal,gbaz/cabal,mydaum/cabal,lukexi/cabal,garetxe/cabal,Heather/cabal,thomie/cabal,kolmodin/cabal,sopvop/cabal,themoritz/cabal,thomie/cabal,themoritz/cabal,lukexi/cabal,mydaum/cabal