Fixed stupid inverted logic bug with ALMIXER_DISABLE_PREDECODED_PRECOMPUTE_BUFFER_SIZE_OPTIMIZATION. I meant for this optimization to be on by default, but it was off. I noticed really slow loading for loadSound on a 5 min mp3 file on Android. (Nobody should be doing this.) The default was hitting the 1k buffer size. I decided to up the default to 4k, but now that the optimization is enabled, it generally won't be hit.