Suppress the matplotlib warning on building fonts.
Suppress the matplotlib warning on building fonts.


Former-commit-id: 49c32f6a94898ff56a6e6c7dc8edc5cccf15ab95
Former-commit-id: e9b218838ebead4f464b03377223871b6edc8177
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox