Fix dependencies of double-conversion on Windows

[Mistuke]

The package double-conversion currently does not work on Windows due to incomplete dependencies specified in the cabal file.

Unfortunately double-conversion hasn't been updated since 2014.

This issue was opened in 2014 with no response from the maintainer haskell/double-conversion#7 and a fix was submitted in October 2015 with again no response from maintainer haskell/double-conversion#13

Given that the package seems to be reasonably popular, and maintainer hasn't responded in 2 years and update needed is minimal. I hope patched cabal file can be uploaded so Windows users don't have to jump through hoops.

There are multiple people and projects whom have hit this issue. e.g.
ucsd-progsys/liquidhaskell#806
and
commercialhaskell/stack#754

[phadej]

Such edit needs NMU

[phadej]

@hvr contacted Bryan via email (He isn't following github actively). Let's wait a bit.

[Mistuke]

Alright :) Thanks for the update!

[hvr]

@Mistuke A new version of double-conversion was just released by @bos which is supposed to fix all known issues. Is there anything left to do here?

[Mistuke]

@hvr No, this fixes the issue. Thanks!