[KPhotoAlbum] Marble versioning

[Tobias Leupold]

> Ok, let's counter this with yet more ugly code, something along this
> line would work for some years:
> 
> set(ALLVERS "24.0.0" "23.0.0" "22.0.0" "21.0.0" "0.28.0")
> foreach(V IN LISTS ALLVERS)
>  find_package(Marble ${V})
>  if (${Marble_VERSION} MATCHES "[02].*\..*") )
>    break()
>  endif()
> endforeach()
> find_package(Marble ${Marble_VERSION} REQUIRED)
> 
> will probably find the newest package for some years to come.
> 
> Harald.

You're right -- but if we do a version check like this, we can as well simply 
check for no version at all, as we do now ;-)

Unless Marble changes it's versioning scheme, I think this will be the only 
reasonable option ...