I decided to add the binaries flent wants instead of leaving it to the
user to ensure they are around because its easier to use that way since
these aren't really optional. flent-gui doesn't always need it but
compared to qt these binaries don't take up much space.
I also switched to using buildPythonApplication's makeWrapperArgs
instead of hacking it in preFixup since this worked fine and seems
better to use the explicitly supported way.