Fix -march/-mtune=native autodetection for Intel Core 2 CPUs
Fix -march/-mtune=native autodetection for Intel Core 2 CPUs

Obtained from:	gcc 4.3 (partial rev. 119454; GPLv2)
MFC after:	2 weeks

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