New Port Request: Primesieve from https://github.com/kimwalisch/primesieve

[Kenneth Wolcott]

Hi Ken C;

  Thank you for the hint.  I have gcc13 for Ada installed and I think
that the gcc got picked up (it has C as well, not pure Ada, so that
Ada can link up with C).

  Sometimes I think it would be great to have three (or more!)
different Macs so that I can customize things without conflicts.  I
guess Docker is the only way to meaningfully do that (I don't have
enough money or space to have that many Mac machines!)

Thanks,
Ken W