Sync from upstream llama.cpp repository

examples/lookahead/README.md

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+# llama.cpp/examples/lookahead
+
+Demonstration of lookahead decoding technique:
+
+https://lmsys.org/blog/2023-11-21-lookahead-decoding/
+
+More info: https://github.com/ggml-org/llama.cpp/pull/4207
+
+Sample command:
+
+```bash
+llama-lookahead -hf ggml-org/Qwen2.5-Coder-3B-Q8_0-GGUF -p "// network server implemented in C\n// author: Peter Hacker\n\n#include" -e -ngl 99 -t 4 -n 512 -c 4096 -kvu
+```