BugLink: https://bugs.launchpad.net/bugs/1852637

Import DIMLIB (lib/dim/) from mainline v5.3 as of
commit f8be17b8 ("lib/dim: Fix -Wunused-const-variable warnings").
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Acked-by: Khaled Elmously <khalid.elmously@canonical.com>
Acked-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>