replace fmod on linux with openal, merge linux and win32 into desktop

[Mjarkiew]

I've replaced FMOD engine on linux platform with openal implementation used for win32 and merged them into AudioEngine-desktop.

I've also provided binaries pull request here: https://github.com/cocos2d/cocos2d-x-3rd-party-libs-bin/pull/394

I did NOT modify the python script that is supposed to resolve symlink for libopenal.so like it was done for fmod.