Auto-download Win SDK on non-Win hosts if 'win' is in target_os in .gclient.

Also, automatically set up a case-insensitive user-space file system mount
for the Windows SDK when on Linux.

This implements https://bugs.chromium.org/p/chromium/issues/detail?id=495204#c82

Bug: 495204
Change-Id: I8c6833570bfffffcfd9b52f31a5ee5e620f46620
Reviewed-on: https://chromium-review.googlesource.com/713999
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508375}

CrOS-Libchrome-Original-Commit: a13ad93cde595521492169db950406efa6612a76
1 file changed
tree: ec07a62408bf0f96fa44a69fcc17e667eb06381e
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/