Fix path to aligned_alloc.h in #include statement (llvm#169418)

This fixes llvm#166172.

Author: googlewalt

libcxx/src/new.cpp

@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "include/aligned_alloc.h"
 #include "include/overridable_function.h"
 #include <__assert>
-#include <__memory/aligned_alloc.h>
 #include <cstddef>
 #include <cstdlib>
 #include <new>