math/calc: Update to 2.16.0.2 and add a "tiny" flavor

The "tiny" flavor reduces the footprint < 20K by statically-linking
the executable and installing nothing else (no help files, no advanced
loadable modules, etc.). This makes it a great option for most
bit/networking/back-of-the-envelope calculations in constrained
environments.

Changes: https://github.com/lcn2/calc/releases/tag/v2.16.0.2