coredump: remove duplicate MESSAGE= prefix from message
    
    systemd-coredump[9982]: MESSAGE=Process 771 (systemd-journal) of user 0 dumped core.
    systemd-coredump[9982]: Coredump diverted to /var/lib/systemd/coredump/core...
    
    log_dispatch() calls log_dispatch_internal() which calls write_to_journal()
    which appends MESSAGE= on its own.
    
    (cherry-picked from commit 4f62556d71206ac814a020a954b397d4940e14c3)
    
    Related: #1664976
    
    patch_name: 0068-coredump-remove-duplicate-MESSAGE-prefix-from-messag.patch
    present_in_specfile: true
    location_in_specfile: 68
    squash_commits: true