clazy gets a different build-ID depending on the build path, which appears
to be because CMake links it with a build-path-based RPATH (which is removed
during installation, but not before it has affected the build-ID).

This can be avoided by building with -DCMAKE_BUILD_RPATH_USE_ORIGIN=ON
(which will be the default in debhelper compat level 14, but that's still
experimental at the moment) as in the attached patch.

    smcv