Additional changes to work with Simon's pull request.

-Remove unneeded glFinish() call in GLWidget.
-Remove unneeded AMD_OS_WIN preprocessor in several projects.
-Define NVIDIA in all projects that use the NvidiaRelease build and depend on OpenCL.

Source/Fractorium/GLWidget.cpp

@@ -251,7 +251,6 @@ void GLWidget::paintGL()
 		glDisable(GL_LINE_SMOOTH);
 		glDisable(GL_POINT_SMOOTH);
 
-		glFinish();
 		m_Drawing = false;
 	}
 }