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cproj, cprojf, cprojl - project into Riemann Sphere
double complex cproj(double complex z);
float complex cprojf(float complex z);
long double complex cprojl(long double complex z);
Link with -lm.
This function projects a point in the plane onto the surface of a
Riemann Sphere, the one-point compactification of the complex plane.
Each finite point z projects to z itself. Every complex infinite value
is projected to a single infinite value, namely to positive infinity on
the real axis.
These functions first appeared in glibc in version 2.1.
In glibc 2.11 and earlier, the implementation does something different
(a stereographic projection onto a Riemann Sphere).
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