cudaPackages: keep $ORIGIN in Runpaths?

[SomeoneSerge]

Describe the bug

We've just observed libnvrtc.so unsuccessfully dlopen()-ing libnvrtc-builtins.so: #224848 (comment). The former had an empty Runpath (except for /run/opengl-driver/lib). Presumably, before autoPatchelf hook it must have been $ORIGIN, since the two libraries live in the same directory. I think we should respect and even prefer $ORIGIN

I suggest we modify the autopatchelf script so as to accommodate:

1. forcefully appending $ORIGIN to the runpaths,
2. and optionally replacing absolute paths with $ORIGIN, when they coincide with the modified library's installation path

Notify maintainers

@NixOS/cuda-maintainers

[SomeoneSerge]

Assuming we start appending $ORIGIN, what happens when symlink we cuda libraries into another location? E.g. symlinkJoin, buildFHSUserEnv (/lib), and /run/opengl-driver/lib

[SomeoneSerge]

Introduced in #226038 to save the trouble, but this is arguably is a dirty hack. I think we should keep adding patchelf --add-needed to make dependencies explicit, because this would be more consistent with the rest of nixpkgs. That said, it would be somewhat nice, if these libraries used DT_NEEDED instead of dlopen in the first place: NVIDIA/build-system-archive-import-examples#5