r300: Use util_blend_factor_uses_dest

v2: Fix missing { and #include (trivial)

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net> [v1]
Reviewed-by: Marek Olšák <marek.olsak@amd.com> [v1]
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6407>
1 file changed