Windows toolchain update

[lonetiger at gmail.com]

Hi Windows devs,

The Windows GCC has been updated to 6.2.0 and binutils to 2.27.

At some point please  rebuild using these binaries. 
Do throw away your old toolchain cache before getting the new one:

rm -rf ghc-tarballs && ./configure --enable-tarballs-autodownload

The plan is to ship these versions with GHC 8.2, though binutils will likely
Get another minor bump.

Thanks,
Tamar

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