windows cabal binaries and upcoming cabal-install release

[Gershom B]

No binaries were built for the 2.4.0.0 release -- I assume with the
upcoming release we'll have proper binaries.

Just wanted to drop a note to _highly recommend_ that at least the
windows cabal-install binaries in the next release be built with ghc
8.6.2 since I think that changes in the core libs will mean that
cabal-install will work better with homedirs with a wider range of
characters. Just talked to someone about this five minutes ago, so its
fresh in my mind :-)

Cheers,
Gershom