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* Bump llama.cpp to b2761

* Adjust types for bump

* parse wide argv characters on windows

* cleanup

* move cleanup to end of `main`

This should resolve a number of memory leak and stability defects by allowing
us to isolate llama.cpp in a separate process and shutdown when idle, and
gracefully restart if it has problems.  This also serves as a first step to be
able to run multiple copies to support multiple models concurrently.

The release just before ggml-cuda.cu refactoring