Add support for the XMEGA C3 Xplained board.

LUFA/Drivers/Board/Buttons.h

@@ -68,13 +68,13 @@
  *  \code
  *      // Initialize the button driver before first use
  *      Buttons_Init();
- *      
+ *
  *      printf("Waiting for button press...\r\n");
- *      
+ *
  *      // Loop until a board button has been pressed
  *      uint8_t ButtonPress;
  *      while (!(ButtonPress = Buttons_GetStatus())) {};
- *      
+ *
  *      // Display which button was pressed (assuming two board buttons)
  *      printf("Button pressed: %s\r\n", (ButtonPress == BUTTONS_BUTTON1) ? "Button 1" : "Button 2");
  *  \endcode
@@ -153,6 +153,8 @@
 			#include "UC3/UC3A3_XPLAINED/Buttons.h"
 		#elif (BOARD == BOARD_STANGE_ISP)
 			#include "AVR8/STANGE_ISP/Buttons.h"
+		#elif (BOARD == BOARD_C3_XPLAINED)
+			#include "XMEGA/C3_XPLAINED/Buttons.h"
 		#else
 			#include "Board/Buttons.h"
 		#endif