[PATCH] Put GNU_UNIQUE symbols into the dynamic section.

[Cary Coutant]

>> Gold has a --no-gnu-unique option that converts STB_GNU_UNIQUE to
>> STB_GLOBAL while writing the dynamic symbol table. This was to work
>> around an issue with older dynamic loaders.
>
> Older loaders are not at all the reason for this flag:
> https://sourceware.org/ml/binutils/2011-10/msg00276.html

Oh, yeah, forgot about that (should have searched instead of relying
on my poor memory!). That, however, was the second time that
STB_GNU_UNIQUE had caused problems; I think the first time really was
because we had a loader that didn't understand the binding at all, but
that reason probably has fallen by the wayside.

-cary