libgnomecanvas: update 2.30.3 to fix build

error message was:
| gnome-canvas-rich-text.c: In function 'gnome_canvas_rich_text_draw':
| gnome-canvas-rich-text.c:2150:2: error: implicit declaration of function 'gtk_text_layout_draw' [-Werror=implicit-function-declaration]

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>