[v3] C99 complex math vs. std::complex

[Gabriel Dos Reis]

Benjamin Kosnik <bkoz@redhat.com> writes:

| Yo dudes. Sorry for the delay. 
| 
| Here's something that should fixup some of the remaining fails for
| Loren. Loren, can you try it out? If it works, and is ok, then I'll
| check it in. 

This looks great to me.  Thanks!

(tangentially, does anybody know that _BUGGY_COMPLEX is still
relevant?  That is for so_7 branch...)

-- Gaby