Previously it was added also when the path was relative and not
prefixed with ./, which was causing issues with building numpy.
(From OE-Core rev: 3e171c89e929a09e4d511a8f235dd90b7cf0d463)
Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>