GitLab

This creates problems when running on a case sensitive file system.

When the path of a checkout contains uppercase characters, the
following command fails:

$ gn gen out/win64 --args='target_os="win" target_cpu="x64"'
ERROR at //build/config/win/BUILD.gn:338:27: Script returned non-zero exit code.
vcvars_toolchain_data = exec_script("../../toolchain/win/setup_toolchain.py",
.... src/build/toolchain/win/setup_toolchain.py", line 240, in main
  assert vc_bin_dir
AssertionError

Bug: None
Change-Id: If4c792e9d04d56987a87a55e824d764a1c4e62ed
Reviewed-on: https://chromium-review.googlesource.com/985835Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547994}