Fix _exit for Linux

[Ulrich Drepper]

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Roland McGrath wrote:

> Systems that don't have it are broken now because generic/libc-start.c
> refers to it.  Either it belongs in the generic code and the generic
> makefile, or it belongs in the sysdeps makefile and a sysdeps libc-start.c.

libc-start.c used __exit_thread only if HAVE_CANCELBUF is defined.  If 
this symbol is defined (at it isn't in the public code) then the 
function is not used.

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