glapi: add missing visibility args

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108829


Fixes: 3218056e "meson: Build i965 and dri stack"
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
(cherry picked from commit 896c59d6)