Run the snippet that creates the output/go/ tree in a subshell.
Tested:
- Built it with hack/build-go.sh
- Ran release/build-release.sh successfully.
- Moved away the git tree to confirm no regression in PR #1073.
- Sourced hack/config-go.sh in the shell, confirmed no variable or
function other than the expected ones leaked into the environment.
- Used `git grep` to confirm the no longer exported variables were
not in use by any script other than config-go.sh.
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
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