[all-commits] [llvm/llvm-project] a2ca1c: build: disable zlib by default on Windows

[Saleem Abdulrasool via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: a2ca1c2d5668683b9a43cddf89131cc106591ee0
      https://github.com/llvm/llvm-project/commit/a2ca1c2d5668683b9a43cddf89131cc106591ee0
  Author: Saleem Abdulrasool <compnerd at compnerd.org>
  Date:   2020-01-02 (Thu, 02 Jan 2020)

  Changed paths:
    M llvm/CMakeLists.txt

  Log Message:
  -----------
  build: disable zlib by default on Windows

zlib usage on Windows has caused issues in the past.  Furthermore, the
GNUWin32 library can be detected and used although the headers are not
available.  Require Windows to explicitly opt in.