Bug#974942: git: parallel building of documentation causes missing content

[Vagrant Cascadian]

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

When the documentation is built in parallel, it can lead to missing
content in manpages and other documentation:

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

The attached patch to debian/rules works around this by disabling
parallel building of the documentation.

live well,
  vagrant
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