Fix install-headers to install <bits/stdio_lim.h>

[Andreas Schwab]

Roland McGrath <roland@redhat.com> writes:

>> Running make install-headers should also install <bits/stdio_lim.h>, this
>> is needed when bootstrapping the toolchain.
>
> headers is usually used for source files.  I think adding to it may break
> some other rules that assume that.

We already add generated files via sysdep_headers.  The only thing that
may break is make dist, but we don't support that any longer anyway.

Andreas.

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Andreas Schwab, SuSE Labs, schwab@suse.de
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