mmc-utils: make use of dependency information generated by gcc

While these dependency information was generated from the start of mmc-utils
it was never used.

Using these informations results in mmc being rebuild when e.g. mmc.h
was touched.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Chris Ball <chris@printf.net>
1 file changed