Revert "[cmake] Enable zlib support on windows"
This reverts commit r319533 as it broke llvm-config --system-libs output
and everything that depends on it (which is mostly out of tree or
downstream folks, but includes a couple of llvm buildbots as well).
I think I have a fix for this in D40779, but I want someone to look
review it first. In the mean time, I am reverting this change, as it
seems to break a lot of people.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319663
91177308-0d34-0410-b5e6-
96231b3b80d8
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