[packagekit] make check and the DBUS backends

[James Westby]

On Fri, 2008-09-12 at 12:44 +0100, Richard Hughes wrote:
> TI:12:38:15	TH:0x96eb458	FI:pk-backend.c	FN:pk_backend_error_code,1422
>  - emit error-code not-supported, This function is not implemented in this backend

I spent a while trying to work out where the dbus call in 
pk-backend-dbus.c should have ended up, but I couldn't see it, so
I had to give up.

Thanks,

James