Remove printfs in exit path

src/shared/platform/win/nacl_exit.c

 /*
  * Copyright 2011 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can
  * be found in the LICENSE file.
  */
 
 #include <stdlib.h>
 #include <stdio.h>
 
 #include "native_client/src/include/portability.h"
 #include "native_client/src/shared/platform/nacl_exit.h"
 #include "native_client/src/trusted/service_runtime/nacl_signal.h"
 
 
 void NaClAbort(void) {
   NaClExit(-SIGABRT);
 }
 
 void NaClExit(int err_code) {
 #ifdef COVERAGE
   /* Give coverage runs a chance to flush coverage data */
   exit(err_code);
 #else
   /* If the process is scheduled for termination, wait for it.*/
   if (TerminateProcess(GetCurrentProcess(), err_code)) {
-    printf("Terminate passed, but returned.\n");
     while(1);
   }
-  printf("Terminate failed with %d.\n", GetLastError());
 
   /* Otherwise use the standard C process exit to bybass destructors. */
   ExitProcess(err_code);
 #endif
 }