[gdk-pixbuf] (7 commits) Non-fast-forward update to branch issue-123

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'issue-123' 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:

  f154d9d... tests: Skip GIF test when the format is not supported
  b66add2... tests: Skip tests when the ref format is unsupported
  cd2d5ab... tests: Skip composite test when PNG is unsupported
  abf0b10... tests: Conditionally build and run tests

Commits added to the branch:

  b22723c... Visual Studio builds: use -utf-8 if available (*)
  37ab8e5... Fix exit status of gen-resources.py (*)
  35dcd72... JPEG: skip bytes during incremental load (*)
  e3adcf0... tests: Skip GIF test when the format is not supported
  19eed7d... tests: Skip tests when the ref format is unsupported
  15cd65a... tests: Skip composite test when PNG is unsupported
  7f0b214... tests: Conditionally build and run tests

(*) This commit already existed in another branch; no separate mail sent