Update cpp_extension.py (#101285)
When we need to link extra libs, we should notice that 64-bit CUDA may be installed in "lib", not in "lib64".
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### <samp>🤖 Generated by Copilot at 05c1ca6</samp>
Improve CUDA compatibility in `torch.utils.cpp_extension` by checking for `lib64` or `lib` directory.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/101285
Approved by: https://github.com/ezyang, https://github.com/malfet
