AddressSanitizer: get rid of stdlib.h, leave (smaller) stddef.h instead.

asan_win.cc

Index: asan_win.cc
===================================================================
--- asan_win.cc	(revision 151158)
+++ asan_win.cc	(working copy)
@@ -16,6 +16,7 @@
 
 #include <dbghelp.h>
 #include <stdio.h>  // FIXME: get rid of this.
+#include <stdlib.h>
 
 #include <new>  // FIXME: temporarily needed for placement new in AsanLock.
 
@@ -260,6 +261,10 @@
   _exit(exitcode);
 }
 
+int Atexit(void (*function)(void)) {
+  return atexit(function);
+}
+
 }  // namespace __asan
 
 #endif  // _WIN32