Corentin Noël authored Feb 16, 2024 and Marge Bot committed Feb 17, 2024

Do not include it at header side as it is not part of the installed headers.

Only keep it in cogl-gl-headers.h as it is a private header.

Add it to all the source files that depend on it.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3593>