Enhance the syzkaller support for NetBSD (350h)

There is an initial functional support for syzkaller for NetBSD (as guest). Resume the porting effort, execute and report kernel bugs.

Milestones:

Ensure completeness of the current support.
Execute the fuzzer and gather reports, narrow down problems, translate to C reproducers.
Add missing features, fix bugs in the NetBSD support.

Last edited mid-morning Tuesday, March 1st, 2022