Delete pbuilder since it is not needed anymore. Change-Id: I685547e9692944b89521864fc3bee4e9a2f1139f Signed-off-by: Antonello Dettori <dev@dettori.io> Reviewed-on: https://review.coreboot.org/15955 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Omar Pakker Reviewed-by: Patrick Georgi <pgeorgi@google.com>