In glib 2.13 memcpy was changed such that the way it copied bytes was reversed.
This caused all sorts of issues for existing software, which depended on the
existing behavior (when they should have been using memmove). See:
https://sourceware.org/bugzilla/show_bug.cgi?id=12518https://bugzilla.redhat.com/show_bug.cgi?id=638477
Now that we require glibc 2.17+ (#17538), we should be well clear of having to
maintain our memcpy -> memmove aliasing, which was introduced in #4339.