- Build wayland backend: switch build_wayland_backend to 1.
- Pass --enable-kms-egl-platform and --enable-wayland-egl-server to
configure.
- Add pkgconfig(gbm) BuildRequires: missing dependency.

- Update to version 1.18.0:
+ The license has been changed to the MIT license.
+ GObject introspection support has been greatly improved.
+ Add cogl_kms_renderer_set_kms_fd to make the KMS backend use a
non-default GPU.
+ Fix a hang in the Wayland backend if it can't find some globals
that it needs.
+ Add cogl_gst_video_sink_get_natural_size to query a suggested
size for a Cogl-GST sink.
+ Add API to query the EGL and GLX contexts. This is intended to
be used to make a shared GL context.
+ Fix advertising the deprecated buffer age feature flag on EGL.
+ Add a new non-deprecated feature flag for the buffer age.
+ Fix a bug with allocating textures in Cogl-GST.
+ Fix a bug with the cogl-basic-video-player example where it
would try to use non-existant mipmaps.
+ Fix selecting the GL driver in the SDL2 winsys.
+ Updates to the MSVC build files.
+ Bugs fixed: Get the opengl context from cogl (bgo#724992).
- Add new typelib-1_0-Cogl-2_0 and typelib-1_0-CoglPango-2_0
subpackages.

- Update to version 1.17.4:
+ Cogl-gst now ensures that sampled video fragments are always
pre-multiplied with the alpha component.