- bsc#1144344: Remove JPEG2000 support due to planned removal of
  jasper, drop pkgconfig(jasper) BuildRequires.

- Port sdl-display operation to SDL2: glgo#GNOME/gegl!184.
  + 0001-Extend-configure-checks-with-checks-for-SDL2.patch
  + 0002-Port-sdl-display-to-SDL2.patch
  + 0003-Port-sdl-draw-example-to-SDL2.patch
- Add autoconf BuildRequires and pass autogen.sh call.
- Replace SDL-devel with libSDL2-devel BuildRequires: Build SDL2
  support.

- Remove unused build dependencies:
  - graphviz-gd is checked for, but unused: glgo#GNOME/gegl!182.
  - gtk-doc generation is disabled, i.e. unused.
  - enscript just regenerates bundled files, add
    fix_doc_installation.patch to avoid the need for this.

- Update to version 0.4.16:
  + Buffer:
    - Swapped behavior of cubic interpolation from cubic to
      mithcell coefficients, leading to crisper results in all uses
      of the cubic sampler.
    - Use a custom allocator for tile data which aligns data and
      groups allocations in blocks - improving performance on
      windows by keeping more slack allocation memory in-process.
      On linux the opposite was needed and is achieved by using the
      GNU extension malloc_trim which permits forcing invokation of
      the glibc malloc/free allocators garbage collection function.
    - Permit tiles to be unreffed after GEGL shut-down without
      crash, which is likely when using bindings to dynamic

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