core: use $(CURDIR) to set TOPDIR
This changes saves a shell call and uses a variable automatically set by make [1]. [1] http://www.gnu.org/software/make/manual/make.html#Quick-Reference Signed-off-by: Samuel Martin <s.martin49@gmail.com> Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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