kinfocenter (FreeBSD): Manually read pciconf's output.

GetInfo_ReadfromPipe() reportedly does not work with pciconf's
output. For now, we just resort to reading the output by
ourselves. Ideally, we should not even need a pipe here, and just use
{Q,K}Process instead.

Based on an original patch by Max Brazhnikov, from the KDE on FreeBSD
team.