Disable debugging symbols for all Emscripten builds. -g is simply too slow to be a useful debugging tool. If someone needs it they should add it back in, but it is not sensible default behavior at this point.
Add destructor for CCGLBufferedNode class to delete GL buffers.
Merge pull request #2673 from j4m3z0r/emscriptenate

Add destructor to CCGLBufferedNode