gitlab-ci: Allow submodule cleaning to fail on Windows
Currently CI is inexplicably failing with ``` $ git submodule foreach git clean -xdf fatal: not a git repository: libffi-tarballs/../.git/modules/libffi-tarballs ``` I have no idea how this working tree got into such a state but we do need to fail more gracefully when it happens. Consequently, we allow the cleaning step to fail.
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