Log Message:
Change bootstrap to register bmake as package. Change bmake to
use inplace libnbcompat like the direct build from bootstrap
does. Fix a long-standing bug in mkbinarykit. The default work
directory was "work" (relative) and therefore MAKECONF=work/...
was passed down, effectively making it a nop. That resulted in
digest being incorrectly installed during the bootstrap.

Tested on DragonFly by myself and on OSF by tnn@, discussed with jlam@