oeqa/sdk/cases/buildcpio: enable use of cached cpio from DL_DIR
All build project test cases will try to copy the requested source
artefacts from DL_DIR before fetching. This testcase is referencing bzipped
tarball whereas the recipe fetches a gzipped tarball.
Switch to fetching the gzipped tarball in the test case so that we're able
to use a cached tarball from DL_DIR
Signed-off-by: Joshua Lock <joshua.g.lock@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
