[gegl] (2 commits) Non-fast-forward update to branch wip/tile-read-lock

[Ell <ell src gnome org>]

The branch 'wip/tile-read-lock' 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:

  f5a0f3a... buffer: add gegl_tile_read_{lock,unlock}()
  9b0976a... buffer: use gegl_tile_read_{lock,unlock}() when reading til

Commits added to the branch:

  affe789... buffer: add gegl_tile_read_{lock,unlock}()
  c016f9c... buffer: use gegl_tile_read_{lock,unlock}() when reading til