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Provide empty DMI stubs for that case until someone implements our own
dmidecode subset.

Tested by Patrick Georgi on top of libpayload.

Corresponding to flashrom svn r1058.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Patrick Georgi <patrick.georgi@coresystems.de>