Failure to transport keys from auth to session stage with pam-1.4.0

[neithernut]

After upgrading PAM on one of my machines pam_e4crypt ceased working: apparently, the retrieval of policies in the session stage fails. I'll have to investigate whether this is a general problem or whether its just some quirk with my setup (pretty much the standard Gentoo setup with elogind rather than systemd). I didn't find anything suspicious in the release notes, at least.

On the up-side, pam-1.4.0 introduces an API for providing an alternative config directory, which enables some testing setups which were not possible, previously.