Primarily because Windows needs a dependency bump to get stm-2.5.1
for Servant build flag.
This includes Win32-2.13.4.0 and aws-0.24 which adds some features
that windows had been missing out on as well.
Lots of warnings about head and tail will need to eventually be
addressed. Of course AFAIK the uses of it in git-annex are all safe.
I can't seem to get stack to resolve dependencies with Win32-2.13.4.0,
no matter what I try. Why it blows up, I don't know.
And allow-newer: true actually causes it to downgrade Win32 to the one
version that won't build. Unbelivable that allows downgrades.
So just gonna have to wait for that to get into stackage nightly, and
then stack.yaml can be updated to use that, and the changes in this
commit reverted.
got build caching working on windows
(The STACK_ROOT may be unncessary, or may be working around some kind of
bug that prevented build caching from working)
sped up build by disabling optimisation
