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485c431b9d
Per @ikawrakow follow-up suggestion in #1729 to "offer the original version at the beginning and note that in case that does not work, they can use GGML_ARCH_FLAGS in that way". Restructured the docs/build.md AVX-512 section so that the recommended high-level CMake options come first, with GGML_ARCH_FLAGS as the fallback for cases where the high-level options don't propagate the necessary macros (older MSVC, ARM cross-compile, exotic toolchains). Empirical confirmation that GGML_AVX512_*=ON activates HAVE_FANCY_SIMD: on MSVC 2022, the resulting compile line (read from build/.../flags.make) contains both `/arch:AVX512` (from GGML_AVX512=ON) and explicit `-D__AVX512VNNI__` / `-D__AVX512VBMI__` / `-D__AVX512BF16__` (added by the matching GGML_AVX512_*=ON options via add_compile_definitions(...) at ggml/src/CMakeLists.txt:1361-1372). The runtime banner prints `HAVE_FANCY_SIMD is defined` and `system_info: AVX512_VNNI = 1`. Also added a brief note about the separate HAVE_VNNI256 gate in iqk_config.h:52-54, which gives meaningful speedups on AVX2-only CPUs with the VNNI extension (some Alder/Raptor Lake parts). Documentation only — no code changes.