Merge pull request #9274 from poettering/comment-header-cleanup

drop "this file is part of systemd" and lennart's copyright from header

diff --cc src/basic/copy.c
Simple merge

diff --cc src/basic/fileio.c
Simple merge

diff --cc src/basic/fs-util.c
Simple merge

diff --cc src/basic/fs-util.h
Simple merge

diff --cc src/core/namespace.c
Simple merge

diff --cc src/sysusers/sysusers.c
Simple merge

diff --cc src/test/test-copy.c
Simple merge

diff --cc src/timesync/timesyncd.c
Simple merge