Revert "radeonsi: always return void from si_build_wrapper_function"

This reverts commit 0aba1743611109545bba86bf055a04ecbe210132.

The vertex shader function for the prim discard compute shader
returns non-void.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7721>
1 file changed