Mark the first slice of a NanoBSD image 'active' by default. This fixes USB boot (not yet merged to HEAD) with 3 flavours of BIOS I've seen.
Mark the first slice of a NanoBSD image 'active' by default.
This fixes USB boot (not yet merged to HEAD) with 3 flavours
of BIOS I've seen.

Approved by:	phk

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase