onnxruntime

Updated build script for CUDA case (#20987)

### Description

In CUDA case, use the cuda_home variable to set CMAKE's CUDA compiler to
a correct version of NVCC

Otherwise, an NVCC from a current PATH would be picked up, which could
be from a different version of CUDA.


### Motivation and Context

I had a case when I had main CUDA installed, and it was a version 11.8.

I wanted to build against 12.5, so I downloaded and unpacked it into a
separate directory and passed it as a `--cuda-home` parameter, however
the ONNX builder was still picking the NVCC compiler from 11.8.

This would fix the issue
https://github.com/microsoft/onnxruntime/issues/20928


cc @gedoensmax