gitlab-ci: allow gimp-win-x64-cross to fail until we have a fix for #11756

Michael Schumacherrequested to merge
schumaml/gimp-win-x64-cross-may-fail into master

Until we have a fix for issue #11756 (closed) and the guaranteed build failures for gimp-win-x64-cross, it is a good idea to allow this job to fail.

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