Sphinx embeds a date in the generated man pages, and to provide
reproducible builds this date needs to be provided to Sphinx,
otherwise it will use the current date.
If building from Git, extract the date from the most recent commit. In
a release, this commit would be the commit that sets the version so is
accurate.
If .git does not exist, use the most recent data found in the
ChangeLog.
The ChangeLog is not used when building from git, as the main/master
branch may not have recent enough timestamps.
This should provide a consistent date when re-building the
distribution from the same non-git archive, or from the same git
commit.
projects / thirdparty / suricata.git / commit
