[gtk] (5 commits) Non-fast-forward update to branch half-float

[Matthias Clasen <matthiasc src gnome org>]

The branch 'half-float' 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:

  a9623d9... ngl: Use fp16 for colors
  7acc633... ngl: Reduce vertex storage
  fc86304... ngl: Use a constant for (fp16)-1
  9b6dd2a... Move color conversion up

Commits added to the branch:

  20e1396... ngl: Use fp16 for colors
  747c8f7... ngl: Reduce vertex storage
  8b890bf... ngl: Use a constant for (fp16)-1
  0a5e4de... Move color conversion up
  cb93260... Dump cpuinfo