Use std::memmove

... and add include for it.
Amends ffb73175e6c5b35e6367c88479cc0bf160482016

Change-Id: I709a5aed13f6f62017b9e4116a03a4dfaae4bb13
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

src/corelib/tools/qcontainertools_impl.h

@@ -49,6 +49,7 @@
 #include <QtCore/qglobal.h>
 #include <QtCore/qtypeinfo.h>
 
+#include <cstring>
 #include <iterator>
 #include <memory>
 
@@ -62,7 +63,7 @@ void q_uninitialized_relocate_n(T* first, N n, T* out)
 {
     if constexpr (QTypeInfoQuery<T>::isRelocatable) {
         if (n != N(0)) { // even if N == 0, out == nullptr or first == nullptr are UB for memmove()
-            memmove(static_cast<void*>(out),
+            std::memmove(static_cast<void*>(out),
                          static_cast<const void*>(first),
                          n * sizeof(T));
         }