This commit fixes binary compatibility, which I broke with my recent cell

This commit fixes binary compatibility, which I broke with my recent cell

Fri Apr 26 21:46:42 2002  Kristian Rietveld  <kris@gtk.org>

        This commit fixes binary compatibility, which I broke with my
        recent cell renderer commits :/.

        * gtk/gtkcellrenderer.h: move cell_background out of _GtkCellRenderer

        * gtk/gtkcellrenderer.c: create GtkCellRendererInfo, with the
        cell_background field and use this as object data. This way we keep
        the field private and dont break ABI.

        * gtk/gtkcellrendererpixbuf.h: remove stock_id, stock_size and
        stock_detail from _GtkCellRendererPixbuf

        * gtk/gtkcellrendererpixbuf.c: create a GtkCellRendererPixbufInfo
        with above mentioned fields. And update everything.