glsl: take EXT_gpu_shader4 in to account when adding round

GL_EXT_gpu_shader4 adds truncate() and round() builtins.

Fixes: 12567de2be7 ("glsl: mark some builtins with correct glsl(es) version check")
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6731>
1 file changed