ggml : expose SSE3 and SSSE3 for MSVC when AVX is available

[przemoc]

Previously only SSE3 was exposed and only when AVX2 was available, but AVX is sufficient to expect presence of SSE3 and SSSE3.

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Upstreaming change done in whisper.cpp:
ggerganov/whisper.cpp#2128

[ggerganov]

I believe these changes are now synced after the recent project sync

[przemoc]

Thanks. I am not familiar with syncing rules, so wasn't sure if it would go back to ggml.

Are these rules described somewhere?

[ggerganov]

Not described, but simply think about the ggml code as a git submodule - changes to that code, pushed in either ggml, llama.cpp and whisper.cpp, are eventually synced to the rest. The syncs are done occasionally, mainly when there are enough significant changes that need to be propagated