Use memmove in QListData::append(int) as regions overlap.

It's undefined behaviour to memcpy regions with overlapping area. You
have to use memmove.

Change-Id: I912c819bf7ab26ba1e60028ee9d7c833dfc5138a
Reviewed-on: http://codereview.qt.nokia.com/1355
Reviewed-by: Olivier Goffart <olivier.goffart@nokia.com>

src/corelib/tools/qlist.cpp

@@ -164,7 +164,7 @@ void **QListData::append(int n)
         if (b - n >= 2 * d->alloc / 3) {
             // we have enough space. Just not at the end -> move it.
             e -= b;
-            ::memcpy(d->array, d->array + b, e * sizeof(void *));
+            ::memmove(d->array, d->array + b, e * sizeof(void *));
             d->begin = 0;
         } else {
             realloc(grow(d->alloc + n));