Fix rsvg.h causing an "internal" deprated warning

Before this patch rsvg.h marks the RsvgSizeFunc *type* as deprecated, and
then uses it to declare other deprecated functions, causing gcc to always
emit a depecrated warning as soon as rsvg.h is included. This breaks
compilation of apps which compile with -Werror.

Fix this by not making the RsvgSizeFunc type deprecated, but leaving
the function prototypes using it as deprecated.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
--- librsvg-2.35.0/rsvg.h~	2011-11-10 19:22:34.000000000 +0100
+++ librsvg-2.35.0/rsvg.h	2011-12-10 09:11:30.525804670 +0100
@@ -203,7 +203,7 @@ void rsvg_handle_free (RsvgHandle * hand
  *
  * Deprecated: Set up a cairo matrix and use rsvg_handle_render_cairo() instead.
  */
-typedef RSVG_DEPRECATED void (*RsvgSizeFunc) (gint * width, gint * height, gpointer user_data);
+typedef void (*RsvgSizeFunc) (gint * width, gint * height, gpointer user_data);
 
 RSVG_DEPRECATED
 void rsvg_handle_set_size_callback (RsvgHandle * handle,
