[opus] CMake patches

[Marcus Asteborg]

Hi all,

With some downtime it's time for some CMake fixes.

Most critically is the SSE fixes to avoid crashes that is described in 154 and 132 in github. Patch 5 should address this and also adding APPROX-FLOAT option.
Hopefully this can give some gains for those of us running on Windows servers.j

I went through the pull request and picked out a few that will ease up integration for consumers of Opus. Those patches are also added here with the original authors as commiters.

I will go through the rest of the CMake related pull requests as well later this week.

It would be nice to setup a CI-Pipeline with CMake builds whoever owns that on feel free to reach out to me and I can do the work needed.

//Marcus
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