commit 8d37958d58cf36f53d5fcc7a8aa6d633da6071b2 inadvertently broke oldmalloc by having it implement __libc_malloc rather than __libc_malloc_impl.
@@ -11,7 +11,7 @@
#include "malloc_impl.h"
#include "fork_impl.h"
-#define malloc __libc_malloc
+#define malloc __libc_malloc_impl
#define realloc __libc_realloc
#define free __libc_free