Fix reproducibility issues

[mzf-guest]

Hello,

here the patch from the Debian package that fixes reproducibility issues:

• Replace date by SOURCE_DATE_EPOCH
• Fix file locale dependent sort of ls for stable inputs

(This pull request invalidates the previous one, based on master instead of develop. Sorry for the noise.)

Best,

François

[prj-]

@mzf-guest, should we close this, or could you address my prior point?

[mzf-guest]

@prj- I've just updated the problematic file to remove the tab to white-space modification. I've also rebased to recent developbranch, so it should be ready to merge. If not, just let me know and I'll update accordingly.

Thanks!

[prj-]

Sorry, I just realised that my comment back from August 2021 was pending and that I did not submit my review...