`libtirpc` has been added because if in Flatpak we compile Samba
without an RPC library it will exit with the following message:
"ERROR: No rpc/rpc.h header found".
Also `rpcsvc-proto` has been added because it provides the required
`rpcgen` binary.
The development flatpak is meant to be used exactly
that: development. It isn't and won't ever be released
as a regular Flatpak application.
GNOME Setting is still supposed to run as a host system
tool.