[retro-gtk] (2 commits) Non-fast-forward update to branch header-fixes

[Adrien Plazas <aplazas src gnome org>]

The branch 'header-fixes' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  9d14a0b... ci: Check that private headers remain private
  72420c0... ci: Check that retro-gtk.h contains public headers
  f29a9ae... ci: Don't use find
  94570f0... ci: Don't use find

Commits added to the branch:

  1b88a53... ci: Check that private headers remain private
  a5d2856... ci: Check that retro-gtk.h contains public headers