MFC: rev. 1.482 + 1.483
MFC: rev. 1.482 + 1.483

Build ipw(4) and iwi(4) modules on i386 and amd64 only.

Approved by:	rwatson (mentor)

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