travis: Uninstall packages before upgrade
numpy (needed by cgal) started having the same issue with linking as python, which makes upgrade and thus the entire build fail on macOS. Instead of playing more tricks with linking/unlinking, just uninstall the problematic packages (and those dragging them in) before doing anything else. Signed-off-by: NAndrea Bolognani <abologna@redhat.com> Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>
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