CompilerCompat: Include compat modules only when they have version.txt

[kevinguitar]

This PR resolves an error when there are stale compiler targets with build dirs, currently they will be picked up because of this check. I've enhanced it a bit and check for version.txt existence.

Could not determine the dependencies of task ':compiler:shadowJar'.
> Could not resolve all dependencies for configuration ':compiler:embeddedClasspath'.
   > Could not resolve project :compiler-compat:k2320_beta2.
     Required by:
         project ':compiler'
      > Unable to find a matching variant of project :compiler-compat:k2320_beta2:
          - No variants exist.
   > Could not resolve project :compiler-compat:k2320_dev_5706.
     Required by:
         project ':compiler'
      > Unable to find a matching variant of project :compiler-compat:k2320_dev_5706:
          - No variants exist.
   > Could not resolve project :compiler-compat:k2320_beta1.
     Required by:
         project ':compiler'
      > Unable to find a matching variant of project :compiler-compat:k2320_beta1:
          - No variants exist.

[kevinguitar]

Let me know if it's better to check for build.gradle.kts, but I think since it's generated via a script, either way should be alright

[ZacSweers]

Works for me ¯_(ツ)_/¯. But there are multiple places that do this so this might not be enough

[kevinguitar]

Ah yeah, I see it now 🙈