Log Message:
mpv: Update multimedia/mpv to 0.29.1

pkgsrc changes:
- py-docutils and waf are tool dependencies

Changes:
Release 0.29.1
==============
A bug fix release for the 0.29 release branch.

Fixes and Minor Enhancements
----------------------------
- af_rubberband: Fix for A-V drift on seeking.
- ao_alsa: Fixes to remove spam during pausing and end-of-file.
- ao_jack: Fix for mpv attempting to connect to non-standard devices such as
           MIDI.
- ao_openal: Drop support for Apple's bundled OpenAL due to lack of features
             to successfully build.
- ao_pulse: Fix for audio buffer length calculation.
- demux_lavf: Fix EDL playback of certain DASH streams.
- demux_lavf: Mark v4l streams as not seekable.
- demux_raw: Fix for gapless playback from raw audio input.
- drm_atomic: Fix to enable video output with devices without a video overlay
              plane.
- encode: Fix for crashes in case of failure to write to output.
- encode: Fix for encoding when utilizing lavfi-complex.
- Fix to strip HDR peak metadata if attached to SDR video (#6111)
- macOS: Capability to fall back on SW rendering for testing purposes.
- macOS: Fix for issues with the main menu.
- macOS: Fix for side by side split view.
- macOS: Fixes for crashes, most notably those happening on 10.14
         (#5908, #6097, #6041, #6062).
- macOS: No longer let older, unsupported versions of the Swift build tools
         through configure.
- manpage: Misc fixups.
- stream_{smb,file}: Fix for partial writes to buffers.
- stream_libarchive: Fix hang when an out-of-bound seek happens.
- stream_smb: Fix for crashes due to libsmbclient and threading (#5936).
- vo_gpu: Fix for corruption when multiple compute shaders override each
          others' block sizes (#6083).
- ytdl_hook: Always load "ytdl://" URLs with ytdl_hook first.
- ytdl_hook: Fix audio streams not being picked up for some sites.

Options and Commands
--------------------
Added
~~~~~
- `--cocoa-cb-sw-renderer` to control whether or not to fall back on software
  rendering on macOS.