journald: periodically drop cache for all dead PIDs
    
    In normal use, this allow us to drop dead entries from the cache and reduces
    the cache size so that we don't evict entries unnecessarily. The time limit is
    there mostly to serve as a guard against malicious logging from many different
    PIDs.
    
    (cherry-picked from commit 91714a7f427a6c9c5c3be8b3819fee45050028f3)
    
    Related: #1664976
    
    patch_name: 0076-journald-periodically-drop-cache-for-all-dead-PIDs.patch
    present_in_specfile: true
    location_in_specfile: 76
    squash_commits: true