Enable CUDA support.

This commit also reintroduces nvcore Library.h and Library.cpp files
required by nvtt/cuda/CudaUtils.cpp

Ref:
https://github.com/castano/nvidia-texture-tools/issues/230
81336cc3e9

Signed-off-by: Elvis Dowson <elvis.dowson@gmail.com>

src/nvtt/cuda/CudaUtils.cpp

@@ -23,6 +23,7 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 
 #include "nvcore/Debug.h"
+#include "nvcore/Library.h"
 #include "CudaUtils.h"
 
 #if defined HAVE_CUDA