Dynamic CUDA support library loading implemented for Linux.

Logical mistake in macro fixed;
DeviceInfo deligate reimplemented;
Build and warning fixes.

modules/core/include/opencv2/core/gpumat.hpp

@@ -137,6 +137,9 @@ namespace cv { namespace gpu
         int deviceID() const { return device_id_; }
 
     private:
+        // Private section is fictive to preserve bin compatibility.
+        // Changes in the private fields there have no effects.
+        // see deligate code.
         void query();
 
         int device_id_;