[Bug libstdc++/66689] comp_ellint_3 and ellint_3 return garbage values

[3dw4rd at verizon dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66689

--- Comment #4 from Ed Smith-Rowland <3dw4rd at verizon dot net> ---
My last comment is nuts.  I was thrown by the fact that GSL, against which I've
been testing, and the Carlson papers that form the basis if the implementation
use the +nu convention.  I must change this.  This is a huge bug.