bug#32342: [PATCH] Allow to override time_stamp with SOURCE_DATE_EPOCH

[Paul Eggert]

On 08/02/2018 02:03 AM, Bernhard M. Wiedemann wrote:
+        if ((source_date_epoch = getenv("SOURCE_DATE_EPOCH")) == NULL || 
(stamp = strtol(source_date_epoch, NULL, 10))

That won't work after 2038 on x32. Also, I'm leery of having environment 
variables affect standard utilities' behavior, though perhaps we could 
shoehorn this in.