Include the typical tarball and expanded tree names, the build logs and the
arch-named directory where the binary RPMs are saved (for now I included only
x86_64, I guess including others should be fine too...)
Tested that after `fedpkg local` git status will not complain about the files
dropped into the git directory.
Signed-off-by: Filipe Brandenburger <filbranden@gmail.com>