Pending fixes for all-ABIs builds

[Florian Weimer]

On 11/09/2016 10:59 PM, Roland McGrath wrote:
> _dl_open_hook is to support the static libdl.a case.
> If a static program dlopen's libc.so, and then libc.so
> wants to dlopen e.g. a gconv module, it has to use the
> static program's dlopen rather than ld.so's dlopen.

Could we put this information into rtld_global_ro, instead of having a 
separate variable?  (Assuming that rtld_global_ro is indeed in read-only 
memory after relocation.)

Thanks,
Florian