fixed GPU module compialtion with CMake 2.8.11

CMake 2.8.11 removed linkage with CUDA driver library,
but it's used by gpu video encoding/decoding
fixed NPP library search (it was splitted)
fixed NPP error constants usage
fixed norm diff function (it uses pre-allocated buffer now)
fixed constructors for functional objects (added __host__ modifier)
Merge pull request #944 from jet47:cmake-2.8.11-cuda-fix
Merge pull request #943 from jet47:cuda-5.5-support