__xstat et al. as compat symbols

[Florian Weimer]

* Adhemerval Zanella:

> Thanks for bring this up, and I agree with you that this breakage might
> incur in more headaches than solutions.  I will send a fix to export
> the xstat symbols in static objects as well, while preserving the compat
> symbols on shared objects.

Sorry, I do not see how the compat symbols work for the Ocaml use case?
The compat symbol is what creates the Ocaml link failure.  It has to be
a non-compat symbol.  We have to rely on lack of use in the installed
headers (which does not seem to be a real problem in this particular
case).

By the way, I verified that glibc 2.0 binaries without symbol versioning
can bind to the __xstat compat symbol.  Apparently binaries can do that
as long as they do not contain any version information at all:

    165100:	binding file /home/fweimer/src/my/glibc-test-binaries/gcc-2.7.2.3/i386/root/usr/bin/gcc [0] to ./libc.so.6 [0]: normal symbol `__xstat'

Thanks,
Florian
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