go_path: support go:embed of generated files (#3285) When embedded files are generated, relativize fails because the file path starts with the output directory. Without the change in path.bzl, the test case fails as follows: Error in fail: Path 'bazel-out/darwin-fastbuild/bin/tests/core/go_path/pkg/lib/renamed_embedded_src.txt' is not beneath 'tests/core/go_path/pkg/lib'