webrtc-audio-processing: initial recipe

PulseAudio has multiple alternative echo canceller implementations.
Probably the best one is the "webrtc" echo canceller, which depends on
this library.

I added some patches to fix building on MIPS and PowerPC. The first
three patches are taken from upstream, the other three patches are my
own. I have only tested that the code builds on all architectures, not
that the code actually works.

Signed-off-by: Tanu Kaskinen <tanuk@iki.fi>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

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