Update binutils to 2.33.1

While here, convert binutils into flavors, that ease a lot maintenance
and helps cleaning out the code.

This is inspired by the same work on going on the xtoolchained gcc by jhb@

PR: 241756
Exp-run: antoine (portmgr)
Discussed with: jhb
Differential Revision: https://reviews.freebsd.org/D22258