eolian_cxx tests failed to link because of massively inexistant symbols.
I assume eolian_cxx tests have been working at some point. Maybe they
were gcc-only? I don't get what's going on with gcc and non-existant
symbols. Is there a sugar-coating of some kind? Because when a symbol
does not exist, clang throws you away. Is it because we are only
referring to the eo implementation functions via function pointers?
That's the second time I'm doing a fix like this. Maybe we should change
a bit our linking flags (see --unresolved-symbols in ld)??
Anyway, now we have our symbols. Clang is happy, make check can go on...