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Signed-off-by: racerole <jiangyifeng@outlook.com>

Make sure that when a shutdown signal comes, we shutdown quickly instead
of waiting for a potentially long exchange to wrap up.

This requires an upstream change to support graceful termination,
carried as a patch.

This wires up logging in llama.cpp to always go to stderr, and also
turns up logging if OLLAMA_DEBUG is set.

Detect potential error scenarios so we can fallback to CPU mode without
hitting asserts.

* update submodule to `6efb8eb30e7025b168f3fda3ff83b9b386428ad6`
* unblock condition variable in `update_slots` when closing server

This one log line was triggering a single line llama.log to be generated
in the pwd of the server

This changes the model for llama.cpp inclusion so we're not applying a patch,
but instead have the C++ code directly in the ollama tree, which should make it
easier to refine and update over time.