bug#22175: /etc/environment not honored by lshd

Hello!

Somehow /etc/environment isn=E2=80=99t honored when logging in via SSH to an
lshd server running on GuixSD, despite the fact that /etc/pam.d/lshd has
this:

--8<---------------cut here---------------start------------->8---
account required pam_unix.so=20
auth required pam_unix.so=20
password required pam_unix.so sha512 shadow
session required pam_env.so=20
session required pam_unix.so=20
--8<---------------cut here---------------end--------------->8---

Ludo=E2=80=99.