backend: build with CUDA compute 5.0 support by default #3499
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It is possible that our llama.cpp backend is compatible with CUDA compute 5.0 GPUs such as the GTX 750 from 2014. This was not believed to be the case before since upstream llama.cpp has not mentioned this officially that I know of, but apparently ollama includes compute 5.0 support in its CUDA 11 backend. We are also using CUDA 11, so it is worth a shot.
Fixes #3481