[babl] (4 commits) Non-fast-forward update to branch wip/pippin/inverted-cmyk

[Øyvind "pippin" Kolås <ok src gnome org>]

The branch 'wip/pippin/inverted-cmyk' 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:

  9620f6a... reference: some cmyk based to rgb based formats go through 

Commits added to the branch:

  9185821... babl-space: add babl-rgb like sRGB with linear TRC
  d0f850c... babl-icc: create double transforms to/from babl-rgb when lo
  da04f7d... reference: some cmyk based to rgb based formats go through 
  4c98fa1... docs: fix typo