The source project of this merge request has been removed.
genxpi: make timestamps in XPI files reproducible
I know Enigmail is "on its way out", at least for Thunderbird, but I suppose late is better than never ;)
zip records the mtime of packed files, making it harder to reproduce the generated file bit for bit. Use the SOURCE_DATE_EPOCH specification that is already respected in other places of this project (package/Makefile) to set the modification time to a known, reproducible value.