handle unknown shader compilation bugs a little better
enable test_sdl_audio_beeps in fastcomp
resolve gl aliases directly, simpler for fastcomp
enable legacy gl emulation in fastcomp
map gl functions to emscripten_ versions to avoid collisions, and to work in fastcomp
deprecate --split option and disable browser tests using it in fastcomp
override emscripten_ versions of gl funcs when gl emulation kicks in