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
