This is useful when building a self-contained, relocatable tree
containing a build of bubblewrap and all of its non-glibc dependencies
(in practice this means libcap and maybe libselinux), as is done in
the Steam container runtime. A RPATH/RUNPATH pointing to ${ORIGIN}/../lib
allows bwrap to find an adjacent, bundled copy of libcap.
Signed-off-by: Simon McVittie <smcv@collabora.com>
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