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Avoid funny interactions between libpci and libusb detection.
Leave libftdi autodetection alone for now.

Corresponding to flashrom svn r1623.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>