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This bugfix release fixes a major regression in the v5.264.0
tone-mapping redesign which resulted in garbage pixels (and unnecessary
tone-mapping) when using an ICC output profile, as well as other minor
miscellaneous fixes.

- fix linear tone mapping resulting in garbage pixels appearing in and
  around black and near-black regions
- fix ICC profiles incorrectly resulting in tone-mapping being enabled
- fix minimum meson version being incorrectly set
- fix HDR10 static metadata minimum brightness not being sent when using
  HDR passthrough
- fix left-over debug junk that could possibly cause a shader
  miscompilation on older GLSL
- fix a possible memleak in pl_renderer
- fix several hypothetical sources of UB inside internal code
- various minor fixes to misleading or missing log messages