The rationale for this change is Apple's OpenAL implementation,
which needs a little time after the
`alSourcei(source, AL_BUFFER, 0);`
call before any buffers used by that source are free for deletion.
The defaults in the config variables are such that the OpenAL manager
will attempt to delete a buffer up to 6 times (that is, the original
attempt plus 5 reattempts), with delays of 1ms, 2ms, 4ms, 8ms, and 16ms
before each reattempt - which means it'll wait a grand total of 31ms for
a buffer to be free before assuming that some even greater problem must
be happening and giving up.
6ca0a68042