[opus] Three new releases

[Peter Robinson]

Hi Jean-Marc,

> I'm announcing two new releases of opus, along with the first release of
> the new libopusenc library.
>
> First for opus, we just fixed a bad bug in the surround encoding code
> that would cause very bad quality on signals beyond a certain amplitude.
> Thanks to Franziska Trojahn and others from HfT Leipzig for finding this
> issue through their listening test[1] (the quality of the two bad files
> in the paper should now be similar to the others). The new 1.1.5 release
> fixes only that bug, while 1.2beta also includes some ARM Neon
> optimizations and low bitrate quality tuning.
> You can download them at:
> https://archive.mozilla.org/pub/opus/opus-1.1.5.tar.gz
> https://archive.mozilla.org/pub/opus/opus-1.2-beta.tar.gz

I've seen two issues with 1.2 beta on Fedora 27 (gcc-7 plus a bunch of
tightened cflags) across a few architectures.

First is on all arches:

/builddir/build/BUILD/opus-1.2-beta/silk/tests/test_unit_LPC_inv_pred_gain.c:114:
undefined reference to `silk_LPC_inverse_pred_gain_c'

Second is a few of them have this error:

/builddir/build/BUILD/opus-1.2-beta/silk/tests/test_unit_LPC_inv_pred_gain.c:91:
undefined reference to `opus_select_arch'

all the build logs for the various arches can be found here:
https://koji.fedoraproject.org/koji/taskinfo?taskID=19718776

Let me know if you've got any queries.

Peter