science/cgnslib: Update to 3.3.1 and modernize

[jrm]

Summary

This update is required to update cad/gmsh to version 4.0.2.

Changes:

• Obtain sources from GitHub
• Use option helpers
• Remove SZIP option, since HDF5 always wants to link to it

Test Plan

poudriere testport 10.4/11.2 i386/amd64 with all option combinations

[thierry]

Thanks!
Do not hesitate to take maintainership if you want.