message: Default to Java 9 on Windows Kokoro
diff: @@ -23,6 +23,9 @@ mkdir out\cmake-release
  cd out\cmake-release
  if errorlevel 1 exit /b %errorlevel%
  +:: Force Java JDK 8. Kokoro machines default to 9
  +SET JAVA_HOME=C:\Program Files\Java\jdk1.8.0_152
  +
  cmake ..\.. -G Ninja ^
  -DCMAKE_CXX_COMPILER:PATH="clang-cl.exe" ^
  -DCMAKE_C_COMPILER:PATH="clang-cl.exe" ^
  