x11: This change allows TfpgX11Image to work with TAgg2D canvas.
x11: This change allows TfpgX11Image to work with TAgg2D canvas.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI