Update __FreeBSD_version check for pci_find_extcap() now that it is present in 6.x.
Update __FreeBSD_version check for pci_find_extcap() now that it is
present in 6.x.

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