* common: introduce http.h for httplib-based client This change moves cpp-httplib based URL parsing and client setup into a new header `common/http.h`, and integrates it in `arg.cpp` and `run.cpp`. It is an iteration towards removing libcurl, while intentionally minimizing changes to existing code to guarantee the same behavior when `LLAMA_CURL` is used. Signed-off-by: Adrien Gallouët <angt@huggingface.co> * tools : add missing WIN32_LEAN_AND_MEAN Signed-off-by: Adrien Gallouët <adrien@gallouet.fr> --------- Signed-off-by: Adrien Gallouët <angt@huggingface.co> Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>