It seems like some of them end up file-local anyways, and the explicit
call to `custom-set-variables` in mail-setup.el had seemingly no effect.
Change-Id: Iad5011b5f8348b1ca5973813995c9644ac85ddf5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2610
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI