Port to platforms where NULL is a pointer
* src/image.c (x_create_x_image_and_pixmap): The Picture type is an integer, not a pointer. Come to think of it, Picture is really XID, and as far as I can tell, all-bits-one is the invalid XID, not all-bits-zero. However that is a bigger issue; for now, this patch just unbreaks the build.
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