emulators/qemu-powernv: rename from emulators/qemu-ppcnv and update to POWER9
Update to benh's qemu power9 branch which adds support for features like radix
mmu and phb.
Take maintainership of this port with Mark's permission from IRC conversation.
Approved by: krion (mentor)
Sponsored by: BBOX.io
Differential Revision: https://reviews.freebsd.org/D17862
Remove compatibility code for FreeBSD < 11.2 from all ports.
Simplify some ports where DragonFlyBSD no longer needs to be special-cased.
Submitted by: rene
Reviewed by: bapt, jbeich
Differential Revision: https://reviews.freebsd.org/D17724