Fix _exit for Linux

[Andreas Jaeger]

Ulrich Drepper <drepper@redhat.com> writes:

> Roland McGrath wrote:
>> I think you can just add the alias to sysdeps/unix/_exit.S instead.
>
> No.  MIPS is one of the platforms without a functioning INLINE_SYSCALL
> implementation.  They need __syscall_* entry points.

I've committed a similar patch that I got from elsewhere today,

Andreas
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 Andreas Jaeger
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