I actually tried installing libstdc++6 from ubuntu's repository. It worked, but on reboot I lost access to my SIM card and not even a rollback of the package fixed it, I had to reflash. I'm willing to give this one a try, but I'm not expecting anything different.

Alternatively, I'm going to try packaging lightspark with libstdc++.so.6 and compiling it to load from that file instead of the maemo one. Ths may be the best option.