specific cdbs makefile for kde 4

[Fathi Boudra]

> it seems sharing a single file (kde.mk) between every packages is the way
> to go. At least, something i'll agree on.
>
> TODO:
> * put cmake.mk in cdbs package (#377524)
> * update utils.mk in cdbs package (#423394)
> * merge kde4 specific stuff in kde.mk

merge kde4 specific stuff in from cmake.mk to kde.mk done.

> @peter: you are involved in the 2 related bug reports, could you do
> something on this ?

when both bug will be resolved, we will be able to use cmake.mk and utils.mk 
provided by cdbs package and not our own version.

kde.mk will be the only single file shared by every kde4 packages.
not the ten-line file easily readable i have in mind but at least a common 
place and a single file.

cheers,

Fathi