This part of w32heap.c is obsolete for quite a long time.
It is not possible anymore to override heap_init() and heap_term()  in libc.
And it is of no use when compiling with the crt dll.

--- src/w32heap.c       2012-02-28 15:34:44 +0000
+++ src/w32heap.c       2012-03-25 11:32:33 +0000
@@ -305,26 +305,3 @@
     sbrk (need_to_alloc);
 }

-#if (_MSC_VER >= 1000 && _MSC_VER < 1300 && !defined (USE_CRT_DLL))
-
-/* MSVC 4.2 invokes these functions from mainCRTStartup to initialize
-   a heap via HeapCreate.  They are normally defined by the runtime,
-   but we override them here so that the unnecessary HeapCreate call
-   is not performed.  */
-
-int __cdecl
-_heap_init (void)
-{
-  /* Stepping through the assembly indicates that mainCRTStartup is
-     expecting a nonzero success return value.  */
-  return 1;
-}
-
-void __cdecl
-_heap_term (void)
-{
-  return;
-}
-
-#endif
-

-- 
Fabrice