Build errors with Bazel 2.1.0

[adamjstewart]

I'm trying to build tensorboard-plugin-wit 1.8.0 and I'm seeing the following build error:

Segmentation fault (core dumped)
/tmp/spackfykr1z5g/dbe23794a6948018e3519954f7cd2e6d/execroot/ai_google_pair_wit/bazel-out/k8-fastbuild/bin/tensorboard_plugin_wit/pip_package/build_pip_package: 1: /tmp/spackfykr1z5g/dbe23794a6948018e3519954f7cd2e6d/execroot/ai_google_pair_wit/bazel-out/k8-fastbuild/bin/tensorboard_plugin_wit/pip_package/build_pip_package: Bad substitution
/tmp/spackfykr1z5g/dbe23794a6948018e3519954f7cd2e6d/execroot/ai_google_pair_wit/bazel-out/k8-fastbuild/bin/tensorboard_plugin_wit/pip_package/build_pip_package: 1: /tmp/spackfykr1z5g/dbe23794a6948018e3519954f7cd2e6d/execroot/ai_google_pair_wit/bazel-out/k8-fastbuild/bin/tensorboard_plugin_wit/pip_package/build_pip_package: Bad substitution
...

This is on Ubuntu 18.04 with GCC 7.5.0 and Bazel 2.1.0. Here are the full builds logs:

• build log
• build env

@aweits