complex.cc log10 buglet...

[Benjamin Kosnik]

> The _G_HAVE_CLOG10 check in complex.cc doesn't seem necessary, as
> clog10 is included in the same directory as c_log.  The latter is
> used in the `replacement' (incorrectly: parentheses are wrong, and
> then the log(10) term needs a static_cast<FLT>()), so is there 
> anything wrong with relying on the clog10 in math/?

Gaby is doing work on complex right now, so this stuff may be in 
transition. In anycase, he's the definitive dude for this stuff.

-Benjamin