Unable to compile against CUDA 13 due to deprecated `thrust::unary_function` and `thrust::binary_function`

[otbrown]

Attempting to build QuEST against CUDA Toolkit 13 results in a string of errors of the form,

error: namespace "thrust" has no member class "unary_function"

and

error: namespace "thrust" has no member class "binary_function"

and they're not wrong -- they were removed in v3.0.0 of CCCL, in line with the removal of the standard library equivalents from C++17.

Having looked at the struct definitions they're very light, so although they're inherited from in a number of places in QuEST, I think stripping them out should be trivial and have no ill effects 👉🪵. I'll aim to get a PR up this week.

[TysonRayJones]

They finally did it 😎 I've been using Thrust in other projects since and it was as simple as removing the parent class, hopefully it's as simple here 🤞

[otbrown]

It is! I've got a branch running through testing locally at the moment (my poor little 3080Ti isn't much of an 'accelerator'!).

We'll throw it on some proper machines for testing as well, but hope to have the fix in by the end of the week 😁