[wxVTK] CMake 2.4.4: required

[Mathieu M. <mat...@gm...>]

I believe I fixed some issues with the API change in between CMake
2.4.3 and CMake 2.4.4


$ cvs ci -m"ENH: Make the project work with CMake 2.4.4 and up"
CMakeLists.txt
Checking in CMakeLists.txt;
/cvsroot/wxvtk/wxVTK/CMakeLists.txt,v  <--  CMakeLists.txt
new revision: 1.23; previous revision: 1.22
done

>From now on, please use CMake 2.4.4 or newer.

Feel free to report any problem you might find (I have not tested the
change on Win32/Apple).

Thanks !
-- 
Mathieu