message: [build] AppVeyor: clean cache when build configuration changes
diff: @@ -11,8 +11,8 @@ environment:
  PATH: 'C:\Python37-x64;C:\Python37-x64\Scripts;%PATH%'
  PYTHONUTF8: 1
  cache:
  -- C:\tools\vcpkg\installed
  -- C:\Users\appveyor\clcache
  +- C:\tools\vcpkg\installed -> appveyor.yml
  +- C:\Users\appveyor\clcache -> appveyor.yml, build_msvc\**, **\Makefile.am, **\*.vcxproj.in
  install:
  - cmd: pip install --quiet git+https://github.com/frerich/clcache.git@v4.2.0
  # Disable zmq test for now since python zmq library on Windows would cause Access violation sometimes.
  