hsc2hs copies #define/#undef directives to generated .hs file when cross-compiling

See summary. This causes a cross-compilation of ghc to fail while building GHC/Stack.hsc from libraries/base, because base.cabal no longer specifies extensions: CPP as of [dfb52c3d5/base].

Edited Mar 09, 2019 by Herbert Valerio Riedel

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