Reverted a few changes adding back soundpool support into android

Builds without errors with and without OPENAL compilation symbol,
without OPENAL symbol you can compile targeting 2.3 like before the
openal change.
Didn't yet test the changes, currently added back soundeffect and song
naming them .AndroidLegacy. I'd like some comment if calling them
.AndroidSoundPool instead. Also pdated a few method names that were
updated.