Opus 1.2.1 release

This fixes an issue where the encoder can misdetect that the signal is SWB
instead of FB, lowpassing the signal. This patch makes the encoder much more
careful about doing that.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
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=Mlix
-----END PGP SIGNATURE-----