[packagekit] don't allow partial updates

[Jesse Zhang]

On 03/29/2011 11:28 PM, Richard Hughes wrote:
> commit 3430b3a28486becc75a899c5527b3df20d602fcf
> Author: Richard Hughes <richard at hughsie.com>
> Date:   Tue Mar 29 16:26:40 2011 +0100
> 
>     Do not set the package checkboxes to be selectable if the backend
> is not able to do UpdatePackages

Thanks Richard. I will have a try. But maybe I have to backport it and
patch my gnome-2-32 build, since we haven't got gtk3 yet.

jesse