Fix Broken smoke-test.sh

[acmcarther]

Related:
#80
#81

Waiting on #81 to finish and get submitted.

---

It seems smoke tests were broken in a variety of ways, some of which are really inexplicable:

1. non_cratesio_library's futures dependency was plainly not compatible with the code. It was trying to use a version of futures that didn't have functions it needed. CI for the PR that made the most recent changes passed, so perhaps we have some kind of caching issue?
2. The workspace name for the example workspace was the same as rules_rust. This apparently confuses Bazel greatly on newer versions of Bazel (but not older ones?)
3. Per the original PR name in smoke-test.sh bazel build X && bazel build Y causes failures in the build of X to not trigger the set -e behavior.

[acmcarther]

[23 / 24] Compiling Rust bin non_cratesio_library (1 files); 0s linux-sandbox
error[E0432]: unresolved import `futures::executor::block_on`
 --> vendored/non_cratesio_library/src/main.rs:7:5
  |
7 | use futures::executor::block_on;
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `block_on` in `executor`

No idea what is going on here. It doesn't make sense for this to fail separately from current master, given the change in this CL, and it doesn't really make sense for it to be failing at all since futures in this example is from git, at a specific tagged release: "0.1.19".

I'll figure out what's going on with this example and update this PR some time today.