Progress on linux compat

CMakeLists.txt

src/Audiosignals/VAAudioSignalSourceManager.h

src/Audiosignals/VAAudiofileSignalSource.h

src/Audiosignals/VAEngineSignalSource.h

src/Audiosignals/VAMachineSignalSource.h

src/VAAudiostreamTracker.h

src/VACoreImpl.cpp

src/VALog.h