Support installing headers for bootstrapping libgcc

[Andreas Schwab]

Roland McGrath <roland@hack.frob.com> writes:

> Just making install-headers install a few more things like bits/syscall.h
> and bits/stdio_lim.h is fine.  Off hand I don't really recall why those
> can't just be in headers (sysdep_headers) and have their own special rules.

That would have meant that it was distributed, which is no longer an
issue.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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