libopus: upgrade to version 1.1.2

This release includes support for Ne10 to improve performance on ARM NEON
capable CPUs. Also, packageconfigs are introduced for controlling whether
Opus uses fixed or floating point processing and whether or not fast
floating point approximations are enabled.

libopus-fpu.inc wasn't doing much, and was fully integrated into the
main recipe.

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>