Pekka Paalanen authored Mar 16, 2022 and Pekka Paalanen committed May 02, 2022

The headless backend does not display to anything, so it doesn't care
what the EOTF mode is. To allow testing compositor internal behavior,
claim to support all EOTF modes.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>