- utils: Add --help, --version and GNU argument parsing to all tools
- capture-libs: Clarify by introducing more temporaries
- capture-libs: Factor out library_cmp_by_name()
- capture-libs: Treat unversioned libraries as in indeterminate order. This avoids always choosing the container version of libgcc_s.so.1 when using a Debian-derived container on Fedora, even if the host version is newer.