Fix _exit for Linux

[Ulrich Drepper]

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Roland McGrath wrote:

> Yes, they need a __syscall_exit alias for _exit.  Why not use an alias of
> the existing _exit instead of having syscalls.list generate a different one?

It's not an alias.  The _exit function does now more than it did before
and the exit syscall is only part of the job.  At least if the
exit_group syscall is also known at compile time.

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