Cross targeting fails on Windows if target runtime contains symlinks

https://github.com/AdoptOpenJDK/jlink.online/blob/e0b932e90aef03350e1a757b62d5b6c6c64fe530/jlink_test.go#L106 fails on Windows. The reason is that the tar.gz for Linux contains symlinks. Those cause `archiver.Unarchive()` to fail (as well as 7zip, so not archiver's fault) with the following error:

```
reading file in tar archive: C:\Users\andreas\AppData\Local\Temp\runtime_cache\OpenJDK11U-jdk_x64_linux_hotspot_11.0.8_10\jdk-11.0.8+10\legal\jdk.localedata\ASSEMBLY_EXCEPTION: making symbolic link for: symlink ..\java.base\ASSEMBLY_EXCEPTION C:\Users\andreas\AppData\Local\Temp\runtime_cache\OpenJDK11U-jdk_x64_linux_hotspot_11.0.8_10\jdk-11.0.8+10\legal\jdk.localedata\ASSEMBLY_EXCEPTION: A required privilege is not held by the client.
```

I'm not sure how to proceed here. https://pkg.go.dev/github.com/mholt/archiver/v3#TarGz has no option to ignore symlinks or continue on error. We could ignore the return code and continue no matter what, but I don't think this is desirable.