(MoHAA/Spearhead/Breakthrough) Music doesn't work when I use save games and quick saves

[gbudny]

Hi

I want to inform you that music works when I start every level in OpenMoHAA. However, the music stops working if I lose during this game and try to reload a level. It also happens when I quit this game and open it again with save games/quick saves.

Can you fix it?

[smallmodel]

As stated in the above commit, the newer experimental sound system is required for this (OpenAL). To use the new sound system, a special CMake flag is required.