The version-clj project uses `.cljx` so I hand-transcribed them to `.cljc`.
Tests are from from version-clj v1.0.2:
https://github.com/xsc/version-clj/tree/clojars-0.1.2
Added `version-clj.via-use-test` to verify loading version-clj via `use`.
Verification via: `./script/run_lib_tests`, I observed version-clj tests:
1. failing for `bb` native v0.2.0
2. passing for `./bb` native built from master
3. passing for `lein bb` from master
This should be the final change that closes#565.
