box2d: another 2.3 / 2.4 incompatibility.
box2d: another 2.3 / 2.4 incompatibility.

Oh come on, the code was SO NICE before, now it's a dumpster fire of
fugly macros and angry casts.

mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples,mosra/magnum-examples