[cairo] _cairo_surface_clone_similar and missing clone_similar in backend

[Christian Biesinger]

Hi,
_cairo_surface_clone_similar seems to do its clone_similar checking 
inconsistently. If clone_similar is null, it is first checked here:
     687     if (surface->backend->clone_similar) {
     688         status = surface->backend->clone_similar (surface, src, 
clone_out);
     689         if (status != CAIRO_INT_STATUS_UNSUPPORTED)
     690             return status;
     691     }

But the fallback code does not nullcheck:
     697     status = surface->backend->clone_similar (surface, 
&image->base, clone_out);

Seems to me like that'd crash if the backend does not implement that 
function...

-biesi
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