Log Message:
Updating math/pari from 2.1.6nb3 to 2.3.5 (newer than PR pkg/38116)

pkgsrc changes:
- Adding license (GPLv2)
- Adding X11 and GMP support (latter via option)
- Adding patches to support math/p5-Math-Pari can be build without
  rebuilding pari again

Upstream changes:
* Primarily a lot of bug fixes
* Plotting API reworked
* More targets are supported