===== RG: r/backports =====
Linux: Set passthru attr to contain full passthru

This fixes #1566, thanks @wizeman

Signed-off-by: Shea Levy <shea@shealevy.com>
kernel.passthru: Don't include meta to be consistent with stdenv.mkDerivation

Signed-off-by: Shea Levy <shea@shealevy.com>
===== RG: r/xfs =====
Make XFS kernel config options optional