Took the opportunity to undo the Godot changed made to the opus source. The opus module should eventually be built in its own environment to avoid polluting others with too many include dirs and defines. TODO: Fix the platform/ stuff for opus.
And opusfile to 0.7.
Clean up the build command line another extra bit.
Remove the extra directories to include that were needed by the Opus library. Now the lib includes more specific paths to avoid those.
