gcc 8.10 compilation fix (#2914)

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>