Bug#1036939: proj: reproducible-builds: build paths trigger differences

[Vagrant Cascadian]

Source: proj
Version: 9.1.1-1
Severity: normal
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: buildpath
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

The RPATH contains the build path resulting in different buildid and
various other differences:

  https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/proj.html

The attached patch modifies debian/rules to pass
-DCMAKE_BUILD_RPATH_USE_ORIGIN=ON to dh_auto_configure.

With this patch applied (and the fix for #1035704 for timezone
differences), based on my local tests, proj should build reproducibly on
tests.reproducible-builds.org!

Thanks for maintaining proj!

live well,
  vagrant
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