gcc 8.10 compilation fix (#2914)

* Use memmove instead of memcpy

gcc 8.1 gives the following error:
lib/lufa/LUFA/Drivers/USB/Class/Common/HIDParser.c:93:5: error: 'memcpy' accessing 42 bytes at offsets 28 and 0 overlaps 14 bytes at offset 28 [-Werror=restrict]

This patch resolve this by using memmove instead

Signed-off-by: Sameeh <Sameeh Jubran>

* Remove ATTR_CONST from a void returning function

gcc 8.10 gives the following error when attempting to compile
lib/lufa/LUFA/Drivers/USB/Core/Events.h:334:5: error: 'const' attribute on function returning 'void' [-Werror=attributes]

Signed-off-by: Sameeh <Sameeh Jubran>

lib/lufa/LUFA/Drivers/USB/Class/Common/HIDParser.c

@@ -90,7 +90,7 @@ uint8_t USB_ProcessHIDReport(const uint8_t* ReportData,
 				if (CurrStateTable == &StateTable[HID_STATETABLE_STACK_DEPTH - 1])
 				  return HID_PARSE_HIDStackOverflow;
 
-				memcpy((CurrStateTable + 1),
+				memmove(CurrStateTable + 1,
 				       CurrStateTable,
 				       sizeof(HID_ReportItem_t));
 

lib/lufa/LUFA/Drivers/USB/Core/Events.h

@@ -331,7 +331,7 @@
 	#if !defined(__DOXYGEN__)
 		/* Function Prototypes: */
 			#if defined(__INCLUDE_FROM_EVENTS_C)
-				void USB_Event_Stub(void) ATTR_CONST;
+				void USB_Event_Stub(void);
 
 				#if defined(USB_CAN_BE_BOTH)
 					void EVENT_USB_UIDChange(void) ATTR_WEAK ATTR_ALIAS(USB_Event_Stub);