Fix _exit for Linux

[Ulrich Drepper]

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Roland McGrath wrote:
> Those fixes look right to me.
> 
> Also about this new exit code, I think that since __exit_thread is declared
> in a generic header and called from generic code, it should not be in the
> sysdeps makefile.  

Not every system might have this function and it is not exported. 
Therefore having the rule in a sysdep Makefile is correct.

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