05492a Add patch from upstream pull-request to add a flatpak-build subcommand

Authored and Committed by Owen W. Taylor a year ago
    Add patch from upstream pull-request to add a flatpak-build subcommand
    
    See https://pagure.io/rpkg/pull-request/361
    
    This also adds PyYAML dependencies - without this, the spec file didn't
    work on EPEL6/EPEL7 and it was hard to test the conditionalization.
    
        
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