Use lowercase windows.h in includes to fix Windows cross compilation using mingw.

src/utils/win/SkAutoCoInitialize.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #define WIN32_LEAN_AND_MEAN
-#include <Windows.h>
+#include <windows.h>
 #include <ole2.h>
 #include "SkAutoCoInitialize.h"
 
 SkAutoCoInitialize::SkAutoCoInitialize() :
     fHR(
         CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE)
     )
 { }
 
 SkAutoCoInitialize::~SkAutoCoInitialize() {
     if (SUCCEEDED(this->fHR)) {
         CoUninitialize();
     }
 }
 
 bool SkAutoCoInitialize::succeeded() {
     return SUCCEEDED(this->fHR) || RPC_E_CHANGED_MODE == this->fHR;
 }