Bug#978609: a2ps: uses embedded copy of help2man which embeds timestamps

[Vagrant Cascadian]

Package: a2ps
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 embedded copy of help2man that a2ps uses to generate manpages is
an old version that does not support SOURCE_DATE_EPOCH, and thus embeds
timestamps in generated manpages.

The attached patch adds help2man to build-depends and patches various
Makefiles to use the system help2man binary, which supports
SOURCE_DATE_EPOCH.

Thanks for maintaining a2ps!

live well,
  vagrant
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