Fixes #30628 by adding new snapshot for dragonfly bsd #30781
                
     Merged
            
            
          
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@alexcrichton please upload the following snapshots:
https://github.com/dhuseby/rust-manual-snapshots/raw/master/rust-stage0-2015-12-18-3391630-dragonfly-x86_64-e74d79488e88ac2de3bd03afd5959d2ae6e2b628.tar.bz2
thanks!