GHC on Windows 10 15019+

[Tamar Christina]

Hi Garrett,

Thanks for the report. I've managed to reproduce the issue and have opened a ticket
here https://ghc.haskell.org/trac/ghc/ticket/13411.

Just the clarify the issue isn't with mingw-w64 or the bundled GCC version. It is with
the gcc driver that we built to override and set some default parameters. 

the actual gcc binary is called realgcc.exe, when you replaced the binaries you overwrote
the wrapper, which may be what's causing your spaces issue.

Tamar