opus.recipe: Port to Meson, enable on UWP
Tested and compared with autotools build on:
Windows (UWP, MSVC, MinGW) x (x86, x86_64, ARM64)
Android Universal (ARM64, x86, x86_64, ARMv7)
iOS Universal (ARM64, X86_64)
macOS (x86_64)
Linux (x86_64, ARMv7)
Comparison was done by ensuring that the same options were enabled, and that the static library had the same objects inside it when built with Autotools and Meson.
The meson port has been submitted upstream: https://gitlab.xiph.org/xiph/opus/-/merge_requests/13