package/ci: temporary workaround to unbreak AppVeyor CI build.

As suggested on https://github.com/appveyor/ci/issues/414 . To be clear,
it's SDK fault, not AppVeyor one.

package/ci/appveyor.yml

@@ -12,6 +12,8 @@ environment:
 install:
 - cinst ninja
 build_script:
+# https://github.com/appveyor/ci/issues/414
+- ren 'C:\Program Files (x86)\Windows Kits\10\include\wdf' '00wdf'
 - call "C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/vcvarsall.bat"
 - appveyor DownloadFile http://kcat.strangesoft.net/openal-soft-1.16.0-bin.zip
 - 7z x openal-soft-1.16.0-bin.zip