message: AppVeyor: don't cache cygwin packages, they are over cache size limit
  anyway.
diff: # TODO: test msvc
  version: 0.0.0.0.1-branch-{branch}-build-{build}
  clone_depth: 10
  -cache:
  - - c:\cygwin-setup-cache -> .appveyor.yml
  environment:
  matrix:
  - cygwin_url: https://cygwin.com/setup-x86_64.exe
  