Add pipewire and iptables to multilib_whitelist for x86_64
    
    This should fix: https://bugzilla.redhat.com/show_bug.cgi?id=1953178
    and pipewire upgrade issues.
    
    Right now the base f34 repo has iptables.i686 and pipewire.i686 in it.
    
    pipewire.i686 would be pulled into updates by mutter.i686, but there's
    not yet a mutter update.
    iptables.i686 wouldn't be pulled in as nothing depends on it, but it's in the
    base repo so thus on users systems.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>