[Fedora-spins] snapshot composes

[Bruno Wolff III]

I just noticed the Beta x86_64 games spin was 7 MiB over the 4GiB limit.
In my testing I had something like 20 MiB to spare. I am not sure what
changed. If there is any reason to believe the size might have dropped
since the beta (maybe due to debugging stuff being removed), I'd be interested
in getting an official size check.

(It's possible I might get a slimmed down version of Nexuiz as otherwise
it has to come out because the 2.5 release is much larger than what's
currently in rawhide.)