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This won't work for the majority of relevant commands because they use the
$(shell) function and GNU make does not relay variables exported within the
makefile to their evironment.

Corresponding to flashrom svn r1914.
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>