This adds a new function, acquire_inhibit_lock, that takes a logind inhibitor lock for the duration of the PAM session. The lock fd is stored in PAM data with pam_cleanup_close. In pam_sm_close_session, the lock is released explicitly by passing NULL to pam_set_data, which triggers the registered cleanup function immediately rather than waiting for pam_end. The inhibit type and reason string can also be configured via the XDG_SESSION_INHIBIT and XDG_SESSION_INHIBIT_WHY environment variables, which take precedence over the module arguments. Fixes: #20654
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