zink: correctly set up fb-sized scissors for each viewport

each viewport must have a corresponding scissor, so we need to generate
an array of these to ensure our states match up

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6349>
1 file changed