This temporarily reverts the image creation for the
LineNumberRulerColumn on Linux to the state before initializing the
buffer image with an ImageGcDrawer. This does currently not work
properly for all use cases on Linux/GTK because of an issue with the
initialization of Image based on existing ImageData due to the usage of
cairo_image_surface_create.

Linux-specific workaround for
https://github.com/eclipse-platform/eclipse.platform.ui/issues/2740