cbfstool: clarify dependencies in Makefile

While logical, make's handling of multiple targets in a rule isn't
intuitive, and was done wrong in cbfstool's Makefile.

%.c %.h: %.l encourages make to run the rule twice, once to
generate the .c file, once for the .h file. Hilarity ensues.

Change-Id: I2560cb34b6aee5f4bdd764bb05bb69ea2789c7d8
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10251
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed