Example of failing Bazel build with C++/CX enabled.

Run build_simple.cmd to see first error, which suggests setting LIBPATH to help find the .winmd files needed or using \AI flags.

Run build_vcvarsall_libpath.cmd to see error after getting LIBPATH set appropriately by calling vcvarsall.bat and passing action_env=LIBPATH. May need to tweek this script to match the location of vcvarsall.bat on your system.