COMP: Fix NUMPY rebuild error ensuring patch are re-applied if needed
Created by: jcfr
If DOWNLOAD_STAMP is modified after the patch has been applied, this mean that the source have been re-downloaded and that the patch must be re-applied.
Fixes https://issues.slicer.org/view.php?id=4452
Reported-by: Andras Lasso lasso@queensu.ca Reported-by: Steve Pieper pieper@bwh.harvard.edu