tests : refactor test-llama-archs to not link internal libllama symbols (#30880)
test-llama-archs included src/llama-arch.h and src/llama-model-saver.h,
which prevented building on Windows with shared libraries since the
used symbols are not exported from the DLL.
- declare llama_arch_* wrappers around the internal llm_ arch query
functions in the llama-ext.h staging header, together with
llama_arch_kv_name() and llama_arch_supports_save()
- slim llama_model_saver down to the private implementation of
llama_model_save_to_file(): the fixture-writer half used by the test
moves into tests/test-llama-archs.cpp as a local kv_writer
- replace the roundtrip saver usage with the public
llama_model_save_to_file() writing to a temp path (also removes the
tmpfile() fd leak and its Windows workaround)
- move test-llama-archs, test-generate-models, test-llama-context and
test-fusion out of the NOT WIN32 OR NOT BUILD_SHARED_LIBS guard
Assisted-by: pi:llama.cpp/ggml-org/GLM-5.3-Flash-GGUF (2x DGX Spark (RDMA, TP=2))
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