releases : build CPU backend separately (windows) #13642
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By building the CPU backend separately it is possible to use clang to compile it even with backends that require a different C/C++ compiler, such as CUDA, SYCL and Vulkan. Using clang to build the CPU backend is preferred since it tends to result in better performance than MSVC.
Additionally, the CPU backend and llama.cpp now are only built once when creating a release.
Test release: https://github.com/slaren/llama.cpp/releases/tag/b5425