create `d_fgimg` matrix before cleaning.

"#error" requires DOS line endings (or fails with fatal error C1004: unexpected end-of-file found)
See: http://connect.microsoft.com/VisualStudio/feedback/details/794991/c-error-directive-and-unix-line-endings-leads-to-an-unexpected-end-of-file
So replace them to #pragma message.

This will allow to disable modules between cmake runs

we doesn't create OpenGL windows by default
OpenGL window must be created by user via namedWindow

OpenCV 2.4.6.2 (Tegra detection and native camera update)