basic: remove unnecessary definition in missing_xyz.h (#36565)

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

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

diff --cc src/core/exec-invoke.c
Simple merge

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

diff --cc src/shared/btrfs-util.c
Simple merge

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

diff --cc src/shared/discover-image.c
Simple merge

diff --cc src/shared/user-record.h
Simple merge