ARM hard-float ABI: add ldconfig flag value

[Roland McGrath]

> >That may have been the original intent of the ELF spec.  But on GNU systems
> >this field has been coopted for purposes that are specific only to the GNU
> >dynamic linker (and linker), not to any machine or operating system.
> 
> Can you point me at any docs or code for that, please? 

Search around for ELFOSABI_GNU (previously called ELFOSABI_LINUX)
in libc and binutils.