multimedia/mpv: update to 0.33.0

• Add SIXEL option after https://github.com/mpv-player/mpv/commit/19913921eb9e
• Enable OPENAL option after https://github.com/mpv-player/mpv/commit/bca917f6d2c5
• Drop ASS option after https://github.com/mpv-player/mpv/commit/0b9ed9c2744a
• Drop SNDIO option after https://github.com/mpv-player/mpv/commit/71d218eae4b4
• Drop USE_GL=gl after https://github.com/mpv-player/mpv/commit/7831e5223879
• Drop sys/consio.h patch after https://github.com/mpv-player/mpv/commit/427709575d0a
• Bump bundled waf after https://github.com/mpv-player/mpv/commit/3248b073ce59
• Adjust WAYLAND dependency after https://github.com/mpv-player/mpv/commit/007ace76e2d0

Changes: https://github.com/mpv-player/mpv/releases/tag/v0.33.0
Reported by: GitHub (watch releases)