Bug#1021800: pgrouting: reproducible builds: Embeds kernel version of build machine

[Vagrant Cascadian]

Source: pgrouting
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 kernel version of the build environment is embedded in
/usr/lib/postgresql/14/lib/libpgrouting-3.4.so:

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

  Linux-5.18.0-0.deb11.4-amd64
  vs.
  Linux-5.10.0-18-amd64

The attached patch to src/version/version.h.in fixes this by using
CMAKE_SYSTEM_NAME instead of CMAKE_SYSTEM.

According to my local tests, with this patch applied, and the patch
submitted in #102179 to fix timestamps, pgrouting should build
reproducibly on tests.reproducible-builds.org!

Thanks for maintaining pgrouting!

live well,
  vagrant
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