[cairo] Compile failing in xcb backend

[James Cloos]

I just found another typo (it looks like I forgot to re-enable directfb
in my config last night after fixing the first typo in directfb-surface:

diff --git a/src/cairo-directfb-surface.c b/src/cairo-directfb-surface.c
index 3dc3863..fa31b06 100644
--- a/src/cairo-directfb-surface.c
+++ b/src/cairo-directfb-surface.c
@@ -1572,7 +1572,7 @@ static cairo_surface_backend_t cairo_directfb_surface_backend = {
         NULL, /* show_glyphs */
 #endif
         NULL, /* snapshot */
-	_cairo_directfb_is_similar,
+	_cairo_directfb_surface_is_similar,
 	NULL /* reset */
 };
 

With that in place I have a make check compiling now.

I'll followup again once it is done.

-JimC