Add XMEGA support to the class driver demos where possible.

Demos/Device/ClassDriver/AudioOutput/AudioOutput.h

@@ -48,6 +48,7 @@
 
 		#include <LUFA/Drivers/Board/LEDs.h>
 		#include <LUFA/Drivers/USB/USB.h>
+		#include <LUFA/Platform/Platform.h>
 
 	/* Macros: */
 		/** LED mask for the library LED driver, to indicate that the USB interface is not ready. */
@@ -81,6 +82,6 @@
 		                                                   const uint8_t EntityAddress,
 		                                                   const uint16_t Parameter,
 		                                                   uint16_t* const DataLength,
-		                                                   uint8_t* Data);		
+		                                                   uint8_t* Data);
 #endif