This reverts commit 8ecd30d578.
First of all, if it's not tested it shouldn't be committed. Seriously,
test your stuff before committing, particularly when you *add* an API.
If it slips in and we forget it there, once it's released we can no
longer remove it.
Second, EDBus is a complete wrapper over libdbus and is in our intention
to remove libdbus when the EDBus implements the wire protocol itself.
Therefore there's no point in adding a public function to create an
EDBus_Connection from a DBusConnection, even if it's passed as a void
pointer.
61ca9d550d