mpn_sqrtrem{1,2} - patch for pure C implem

[Adrien Prost-Boucle]

On Sat, 2017-04-01 at 21:58 +0200, Marc Glisse wrote:
> Did you run "make distclean" between the 64-bit build and the 32-bit
> build? (doing the build out-of-tree avoids this kind of problem, since
> you can easily do the 32-bit build in a different directory)

I did clean but forgot about distclean... that's embarrassing -_-
Thanks!

Now GMP compiles in 32-bit.
The check also passes with success, with the patch I just sent!

Adrien