glsl: fix per_vertex_accumulator::fields size

49d35f3d882bd0f4418a1ce056344b8f06bd75dd moved gl_Layer/gl_ViewportIndex/gl_ViewportMask
as builtins but fields size wasn't increased.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3508
Fixes: 49d35f3d882 ("glsl: declare gl_Layer/gl_ViewportIndex/gl_ViewportMask as vs builtins")
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6688>
1 file changed