Enable native backend for DragonFly BSD (#14431)
* Enable native backend for DragonFly BSD
Without this, it's not possible to build ocamlopt on DragonFly BSD.
Tested-on: DragonFly 6.5
* Add Changelog entry
* Mention DragonFly has Tier 2 support of native-code compiler
I like mentioning DragonFly in close proximity to the other BSDs,
ideally next to FreeBSD, as it shares most similarities with FreeBSD.
In this case, FreeBSD is in Tier 1, so mention it after OpenBSD. Sorry
for shifting OmniOS to the right.
As of the naming: We call it "DragonFly" and only sometimes "DragonFly
BSD" when talking to non-DragonFly people.
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