[PATCH] malloc: Remove unused aliases for malloc symbols

[Florian Weimer]

* Wilco Dijkstra:

> Another thing I need to think about is how to support no multiarch if
> that is still required. We'd probably have to dispatch using a
> function pointer computed by the ifunc selector...

No-multiarch support should be relatively straightforward, given that we
also need to support targets without IFUNC support.

Thanks,
Florian