macOS: buildTopology in kernel now fills output buffer directly

[nealsid]

Previously, buildTopology would allocate a buffer, fill it, and copy it to the output buffer. The buffer passed from userland is of the same type that the kernel needs, and it is easier to fill it directly. Also added comment clarifying need to keep types in user/kernel land in sync.

[nealsid]

please see my comments. Also please remove simdjson update from the change:

Will do