* OpenFL version compatibility fix
Uses var alias "__source" on 9.2.2 or "__audioSource" on latest, in case of using latest libraries.
* Revert "OpenFL version compatibility fix"
This reverts commit aa83aee5a5.
* OpenFL Compatibility fix
Uses (compiles) "__source" or "__audioSource" variable depending of the OpenFL version, in order to not break FlxSound.
* Revert "OpenFL Compatibility fix"
This reverts commit 18a9aeddf9.
* OpenFL compatibility fix (get/set var)
(suggestion by @NeeEoo) uses an auxiliary "__audioSource" variable for usage on latest OpenFL versions, in order to not break FlxSound class.
