Fix mismatched aliased event and event stub function prototypes.

.../Device/ClassDriver/DualVirtualSerial/DualVirtualSerial.c

Demos/Device/ClassDriver/VirtualSerial/VirtualSerial.c

...river/VirtualSerialMassStorage/VirtualSerialMassStorage.c

...evice/ClassDriver/VirtualSerialMouse/VirtualSerialMouse.c

LUFA/Drivers/USB/Class/Device/AudioClassDevice.c

LUFA/Drivers/USB/Class/Device/AudioClassDevice.h

LUFA/Drivers/USB/Class/Device/CDCClassDevice.c

LUFA/Drivers/USB/Class/Device/CDCClassDevice.h

LUFA/Drivers/USB/Class/Device/PrinterClassDevice.c

LUFA/Drivers/USB/Class/Device/PrinterClassDevice.h

LUFA/Drivers/USB/Class/Host/CDCClassHost.c

LUFA/Drivers/USB/Class/Host/CDCClassHost.h

LUFA/Drivers/USB/Core/Events.c

LUFA/Drivers/USB/Core/Events.h