[gdk-pixbuf] (2 commits) Non-fast-forward update to branch wip/run-gif-tests-again

[Simon McVittie <smcv src gnome org>]

The branch 'wip/run-gif-tests-again' 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:

  76bec6f... tests: Don't check whether bmp and gif loaders are enabled

Commits added to the branch:

  bf13fc4... gif: Do all of gif_init() with a single read
  9d4d7e5... tests: Don't check whether bmp and gif loaders are enabled