lfc is broken on master and in our release artifacts

[cmnrd]

lfc fails for the C++, Rust, and TypeScript targets, because it cannot load the Kotlin classes. I am clueless on what might be causing this, but something in the build setup must have changed recently. For this reason, the lfc 0.1.0-beta release artifacts to not work currently.

I also wonder why none of our tests revealed this problem.

[petervdonovan]

I think this problem actually did appear in CI in the release branch, and it seemed to be a problem with Gradle's incremental build feature. Our "solution" was to use ./gradlew clean.

[housengw]

maybe we could add try ./gradlew clean in the error message as a pointer...

[lhstrh]

Confirming that the problem was how the artifacts were built (without clean). There is nothing actionable w.r.t. the code. I will create a separate issue to address apparent deficiency in our Gradle configuration.

[lhstrh]

maybe we could add try ./gradlew clean in the error message as a pointer...

I think we should just fix the build configuration (as per #930). While the suggested error message might be useful for us, it won't be useful for third-party users (who don't build from source).