0 A.D. another game to consider packaging

For anyone looking for something to do, 0 A.D. seems to be something worth packaging. It is similar to Age of Empires (which also makes it a bit like Empire Earth, but it is a lot closer to Age of Empires). It is still alpha, but getting it into Fedora might get them some more testing and possibly contributors. With one very small fix to get it to build with gcc 4.7 (which I reported to upstream 0 A.D., though it's really an nvtt issue), I was able to build it. The game includes a few bundled libraries we don't have in Fedora (at least nvtt and spidermonkey) and uses a more recent version of enet than we have. Some of these may only be needed to develop for the game and not to actually play it. I haven't looked to carefully at this. I'll probably do some chipping away at some of the prerequisites, but have other games to work on, so it won't happen very quickly.