[openal] Not Find DirecSound on Windows

[William Wolff]

Hi!

I download OpenAL Soft on my Windows machine and cmake it properly and everything was fine, but cmake not find the DSOUND Backend and not properly create the Project to support it.
This is strange because DirectX are not being distributed anymore, but are coming natively with the S.O.

I need make additional configurations to find this backend properly?

Kind Regards.
William Wolff