Adapt to https://github.com/coq/coq/pull/15754 (removal of Int63.v that was deprecated in 8.14).
This is backward compatible (tested locally with 8.13, 8.14 and master).
Prochaines maintenances programmées: lundi 06/05, lundi 03/06, lundi 01/07
Pour plus d'informations: https://doc-si.inria.fr/display/SU/Gitlab
Adapt to https://github.com/coq/coq/pull/15754 (removal of Int63.v that was deprecated in 8.14).
This is backward compatible (tested locally with 8.13, 8.14 and master).