Always create convenience symlinks for Kythe (#1145)

Some projects set --experimental_convenience_symlinks=ignore in their .bazelrc file, which will cause the kzip merging step to fail, as it globs under bazel-out/.

The real fix would be to glob under `$(bazel info output_path)/` instead of `bazel-out/`, then we would not need the convenience symlinks for our purposes, but this is easier and helps for now.
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