Note that c.f needs to be closed _before_ taking or freeing
the buf pointer, as it might be invalidated

Parsing objects is risky as data could be malformed or malicious,
so avoid doing that from the main systemd-coredump process and
instead fork another process, and set it to avoid generating
core files itself.

Allow later usage when we only want to fetch the JSON packaging metadata

systemd-pstore does not use any symbol from libdw, and never did,
but the dependency was listed since the beginning

In order to avoid inflating the dependency list for the core
library, use dlopen when inspecting elfs, since it's only
used in two non-core executables.