Remove sentence saying that glibc adds a flags argument to the syscall;
that was only relevant for the older eventfd() system call.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Linux 2.6.27 added eventfd(), which supports a flags argument
that eventfd() did not provide. The flags so far implemented
are EFD_NONBLOCK and EFD_CLOEXEC,
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>