fix dllwrap issue.
fix dllwrap issue.

Summary: Always set dllwrap and windres values.

Reviewers: austin, hvr, bgamari, trofi

Reviewed By: trofi

Subscribers: rwbarton, thomie, erikd

GHC Trac Issues: #13792

Differential Revision: https://phabricator.haskell.org/D3775

sdiehl/ghc,sdiehl/ghc,ezyang/ghc,ezyang/ghc,shlevy/ghc,shlevy/ghc,sdiehl/ghc,shlevy/ghc,ezyang/ghc,sdiehl/ghc,shlevy/ghc,sdiehl/ghc,shlevy/ghc,shlevy/ghc,ezyang/ghc,ezyang/ghc,sdiehl/ghc,ezyang/ghc,sdiehl/ghc,ezyang/ghc,shlevy/ghc