[don't merge] icedtea7: Update from 2.4.7 -> 2.5.2

I got it to compile but the build still fails with this status:

```Failed: cycle detected in the references of `/nix/store/a4s9aqm45il2620839slgz46nv15637f-icedtea7-2.5.2'```

Any idea what this could be or how to fix it?