_exit.2, access.2, alarm.2, close.2, link.2, mkdir.2, mknod.2, open.2, read.2, rename...

_exit.2, access.2, alarm.2, close.2, link.2, mkdir.2, mknod.2, open.2, read.2, rename.2, rmdir.2, s390_runtime_instr.2, symlink.2, unlink.2, write.2, remove.3, charsets.7: srcfix: Tidy copyright notices

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>