FFADO 2.4.8 tarball fixed

It has recently come to light that the source tarball for FFADO 2.4.8 included an extraneous top-level directory in the directory structure. While this doesn’t prevent the source from building, it may create problems for automated build scripts. The FFADO 2.4.8 tarball has been refreshed to remove the unnecessary top-level directory, making its structure consistent with all previous FFADO source tarballs.