Add windows supoort

zhenghaozrequested to merge
zhenghaoz/libsqlite_vec:windows into master

Actually, I need help. I don't know there is extra iq characters in:

v2 = uint64(iqlibc.X__builtin_popcountll(tls, *(*Tu64)(unsafe.Pointer(a + uintptr(i)*8))^*(*Tu64)(unsafe.Pointer(b + uintptr(i)*8))))

It should be:

v2 = uint64(libc.X__builtin_popcountll(tls, *(*Tu64)(unsafe.Pointer(a + uintptr(i)*8))^*(*Tu64)(unsafe.Pointer(b + uintptr(i)*8))))

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