!): Fix for ubuntu 18.04 link error.

[tbfly]

Fix for Linux ubuntu 18.04 desktop bazel run example link error.

[jiuqiant]

Thanks for the PR.

If you append --define 'libunwind=true' to the bazel build command, it should solve the link error as well. We don't do this by default because the define flag is not needed if we start from a fresh ubuntu 18.04 system. We will document this issue in the coming release.

[tbfly]

Thanks for the PR.

If you append --define 'libunwind=true' to the bazel build command, it should solve the link error as well. We don't do this by default because the define flag is not needed if we start from a fresh ubuntu 18.04 system. We will document this issue in the coming release.

thx