can-utils: Don't overwrite PREFIX and DESTDIR when provided via the environment
For creating a Debian package providing PREFIX and DESTDIR via the environment is the easiest option. So use ?= to assign these two variables to honor the values in the environment. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>pull/1/head
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