gegl_0_4: 0.4.14 -> 0.4.16 (#61292)

* gegl_0_4: 0.4.14 -> 0.4.16
Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
https://repology.org/metapackage/gegl/versions

* gegl_0_4: drop Darwin patches
They were merged upstream and shipped with v0.4.16