gallium/util: allow scaling blits for stencil-fallback

We also need to be able to scale the stencil-blits, so let's pass the
full destination box instead of just the position.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6898>
2 files changed