Fix _exit for Linux

[Ulrich Drepper]

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Jakub Jelinek wrote:

> There is a difference between libc_hidden_def in .S files and in .c files.
> In .S files it will work even if libc_hidden_proto () was not declared
> in header files (usually the assembly doesn't even include those headers),
> while if you use libc_hidden_{def,weak} without previous libc_hidden_proto,
> things will break badly...

Anyway, the _exit code can now be hidden.  The implementation in glibc 
itself is now correct if compiled with the new kernel headers so there 
is no need to allow it to be overwritten.  Let's change include/unistd.h 
and add hidden everywhere for _exit.

- -- 
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Ulrich Drepper  \    ,-------------------'   \  Sunnyvale, CA 94089 USA
Red Hat          `--' drepper at redhat.com   `------------------------
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