Log Message:
Update multimedia/mpv to mpv-0.23.0

Changes:
Release 0.23.0
==============
Now requires at least FFmpeg 3.2.2.

Features
--------
- vo_rpi: partially undeprecate

Added
~~~~~
- vo_opengl: hwdec_cuda: Support P016 output surfaces

Removed
~~~~~~~
- charset_conv: drop enca and libguess support in favor of uchardet
- vf_vdpaurb: remove this filter in favor of --hwdec=vdpau-copy

Options and Commands
--------------------
Added
~~~~~
- TOOLS/autoload: allow disabling through script-opts
- demux, stream: add --access-references to prevent opening referenced files

Deprecated
~~~~~~~~~~
- options: deprecate codec family selection in --vd/--ad

Removed
~~~~~~~
- macOS: remove --fs-black-out-screens
- options: remove deprecated sub-option handling for --vo and --ao

Fixes and Minor Enhancements
----------------------------
- Windows: window styles improvements (allow minimizing borderless/fullscreen \ 
window) (#2229, #2451)
- ad_spdif: Fix crash when spdif muxer is not available
- audio: fix --audio-stream-silence with ao_alsa
- audio: fix --audio-stream-silence with ao_wasapi
- build: drop build-time dependency on Perl
- build: support linking ANGLE (previously loaded dynamically)
- d3d11va: unconditionally load D3D DLLs (#3348)
- demux_mkv: fix seeking in some broken files (#3920)
- hwdec_cuda: allow building without CUDA SDK (load CUDA dynamically)
- macOS: fix dropping of URLs containing query strings on the window
- macOS: fullscreen refactoring (#2857, #3272, #1352, #2062, #3864)
- macOS: support append file to paylist on drop (#2166)
- macOS: update the menu and remove conflicting “Quit & remember \ 
position” item (#3865)
- osc: don't hide playlist buttons, just disable
- osc: fix possible race condition in right timecode
- osc: topbar: use same styles as bottombar
- player: don't print format detection error when aborting loading
- vdpau: fix vaapi probing if libvdpau-va-gl1 is present
- video: use demuxer-signaled duration for last video frame (#3924)