Illegal usage of memcpy when copied data is copied into itself

[benjamin-weiss]

libmpegh copies USAC payload data between internally allocated buffers that under (un)certain circumstances may point to the same memory i.e. the data is being copied into itself. C standard explicitly states that memcpy() copying data between overlapping objects is undefined and thus it triggers warnings in various debugging tools. memmove() should be used instead in such circumstances.

Here is a patch to fix the issue: 0001-Use-memmove-instead-of-memcpy-since-both-pointers-ma.PATCH