Bug#1021751: dc3dd: reproducible-builds: date in dc3dd manpage

[Vagrant Cascadian]

Source: dc3dd
Severity: normal
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: timestamps
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

The date is embedded in /usr/share/man/man1/dc3dd.1.gz:

  https://tests.reproducible-builds.org/debian/rb-pkg/bookworm/amd64/diffoscope-results/dc3dd.html

  .TH·DC3DD·"1"·"October·2022"·"dc3dd·7.2.646"·"User·Commands"
  vs.
  .TH·DC3DD·"1"·"November·2023"·"dc3dd·7.2.646"·"User·Commands"

The attached patches fix this by adding help2man to Build-Depends and
using the packaged version of help2man from Makefile.am.

According to my local tests, with these patches applied dc3dd should
build reproducibly on tests.reproducible-builds.org!

Thanks for maintaining dc3dd!

live well,
  vagrant
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