Add a needs clause to the jsexec smoketest job

jobs in the 'test' stage are supposed to run only after all jobs in the 'build'
stage so I don't understand why this would be needed, but I'm getting pipeline
failures with it trying to run this test before building anything. Or maybe its
something else (no artifacts?).

.gitlab-ci.yml

@@ -27,6 +27,7 @@ smoketest-jsexec-linux:
   tags: [Linux]
   image: gcc
   stage: test
+  needs: ["sbbs-linux"]
   script:
     - cd src/sbbs3
     - "*.exe.release/jsexec -r 'exit(42)'"