lavapipe: change min shader param to use pipe_shader_caps

MSVC does not support GCC ({}) macro extension, so have to
use offsetof().

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33176>
1 file changed