contrib/ci.inria.fr/job-1-build-windows.sh: avoid timestamp errors

contrib/ci.inria.fr/job-1-build-windows.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 # StarPU --- Runtime system for heterogeneous multicore architectures.
 #
-# Copyright (C) 2013-2020  Université de Bordeaux, CNRS (LaBRI UMR 5800), Inria
+# Copyright (C) 2013-2021  Université de Bordeaux, CNRS (LaBRI UMR 5800), Inria
 #
 # StarPU is free software; you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as published by
@@ -28,6 +28,7 @@ fi
 basename=$(basename $tarball .tar.gz)
 test -d $basename && chmod -R u+rwX $basename && rm -rf $basename
 tar xfz $tarball
+touch --date="last hour" $(find $basename)
 version=$(echo $basename | cut -d- -f2)
 winball=starpu-win32-build-${version}