This is a follow-up to commit 290ac5cd1e.
* gnu/packages/polkit.scm (polkit-mozjs)[source](snippet): Add substitutions.
[source](patches): New field.
[arguments]: Pass --sysconfdir and -Dsession_tracking in #:configure-flags.
* gnu/packages/patches/polkit-disable-systemd.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.