Since commit a4d03bbc, "make dist" has
built both gzip- and bzip2-compressed tarballs.  However, this was
pretty useless, because our tarball build script didn't know about it
and proceeded to overwrite the bz2 file with new data.  Back-patch the
change to all active branches, so that creation of the tar.bz2 file
can be removed from the build script.