[babl] (5 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:

  de0fc82... build: check for and link against lcms2
  8de9fcf... babl: implement own reference code paths for CMYK color spa
  0b489b1... extensions: replace naive-CMYK with new CMYK extensions
  64c6a41... babl: comment out unused model_is_rgba
  5d68fe2... docs: update with information about CMYK
  117f067... fish-reference: add workaround for bizarre behavior that di
  b67ea2e... babl-fish: print error message instead of blowing stack
  5a23818... babl-space: improve initializiation of sRGB data in cmyk sp
  d06f905... docs: update
  aaf3184... babl: hold mutex during reference conversions
  d0ee6fb... CMYK: register u16 variants
  2242478... cmyk: add capitalized model and components, where 1 is blac
  49e5c23... CMYK: drop rgb related conversions - through the new refere
  4875717... CMYK: add back non-inverted CMYK model
  9707c3b... add XXX todo marker to babl_sanity
  e8227f0... add cmyk inverter
  0fd6098... babl: do collisions in a different manner

Commits added to the branch:

  b471158... babl-fish: print error message instead of blowing stack
  b266146... babl: comment out unused model_is_rgba
  0f37641... build: check for and link against lcms2
  92c3682... babl: implement proper CMYK support
  fa6629f... docs: update with information about CMYK