[opus] [PATCH] Add ARM cpu detection for iDevices

[Tom Hughes]

This adds run-time CPU detection for iOS devices. I found this page useful
for CPU support and models: http://iossupportmatrix.com/

The patch could be simplified to just set the OPUS_CPU_ARM_NEON flag if you
think it's unlikely that anyone would be running on the really old devices
that don't support NEON.

Tom
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