[opus] CMake fixes for ARM cpus

[Nathaniel Lewis]

Hello all,

I filed some PR's on a few fixes for using the CMake build system for ARM
cpus. Specifically I tested this by building for android via
externalNativeBuild in android studio.

https://github.com/xiph/opus/pull/136
https://github.com/xiph/opus/pull/137

- Nathan
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