Not specifying -C caused oe-build-perf-test to try to commit results to
the build directory.
(From OE-Core rev: 6f4786f5522c366a7fd92f630c3f32629a9f9471)
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>