This is the important line hiding in here that's building the SWF.  Note some changes here:

- "-use-network=false" was removed.  This is only needed if you're loading the SWF from the local file system and also trying to load files within the SWF that are stored on the local file system (and then you can't use the network in that case).  I don't think this is what anybody really wants as the default and never really see this used.
- "-static-link-runtime-shared-libraries=true" was removed.  No Flex runtime share libraries are used, so this isn't needed, and you can see the same SWF size with or without this included.  Plus the runtime shared libraries are now out of date with Apache Flex.
- "-target-player=10.3" added.  This makes sure a specific Flash Player version is targeted as the baseline.