[oe] Using libpam with systemd but without systemd-logind

[Matt Spinler]

Hi,

Our embedded system uses systemd and libpam, but doesn't use systemd's
logind package.

The libpam recipe,
https://github.com/openembedded/openembedded-core/blob/master/meta/recipes-extended/pam/libpam_1.3.0.bb#L149,
will add pam_systemd.so to common-session if it detects systemd is used.

However, systemd will only even build pam_systemd.so if the logind 
package is enabled, shown here:
https://github.com/systemd/systemd/blob/15b1180945f2cfa0f7938626ff060c8b52606a1a/meson.build#L1747

So in our case, since we are explicitly disabling logind, pam will 
complain
in the journal about not being able to find pam_systemd.so.

As logind isn't a systemd distro feature, I'm not sure how libpam can 
really know
that it doesn't need to add pam_systemd.so to common-session?

Does anyone have any ideas on ways to handle this?

Thanks,
Matt