runtimes: Convert hard-linked DRI drivers and interpreters to symlinks

The Steam CDN probably doesn't understand that hard links are a thing that can exist, so will see these as multiple identical files, wasting a lot of disk space (particularly for the DRI drivers, some of which statically link LLVM).

I've only done this for larger files: for small files like gunzip it isn't worth it.

Helps: T27130