Clean up a few includes, introduce iwyu.

include/core/SkPostConfig.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPostConfig_DEFINED
 #define SkPostConfig_DEFINED
 
-#if defined(SK_BUILD_FOR_WIN32) || defined(SK_BUILD_FOR_WINCE)
+#if defined(SK_BUILD_FOR_WIN32)
 #  define SK_BUILD_FOR_WIN
 #endif
 
 #if defined(SK_DEBUG) && defined(SK_RELEASE)
 #  error "cannot define both SK_DEBUG and SK_RELEASE"
 #elif !defined(SK_DEBUG) && !defined(SK_RELEASE)
 #  error "must define either SK_DEBUG or SK_RELEASE"
 #endif
 
 #if defined(SK_SUPPORT_UNITTEST) && !defined(SK_DEBUG)
@@ skipping 186 matching lines @@
          SK_ ## C0 ## 32_SHIFT == 24)
 #else
 #  define SK_PMCOLOR_BYTE_ORDER(C0, C1, C2, C3)     \
         (SK_ ## C0 ## 32_SHIFT == 0  &&             \
          SK_ ## C1 ## 32_SHIFT == 8  &&             \
          SK_ ## C2 ## 32_SHIFT == 16 &&             \
          SK_ ## C3 ## 32_SHIFT == 24)
 #endif
 
 //////////////////////////////////////////////////////////////////////////////////////////////
-#ifndef SK_BUILD_FOR_WINCE
-#  include <string.h>
-#  include <stdlib.h>
-#else
-#  define _CMNINTRIN_DECLARE_ONLY
-#  include "cmnintrin.h"
-#endif
 
 #if defined SK_DEBUG && defined SK_BUILD_FOR_WIN32
 #  ifdef free
 #    undef free
 #  endif
 #  include <crtdbg.h>
 #  undef free
 #
 #  ifdef SK_DEBUGx
 #    if defined(SK_SIMULATE_FAILED_MALLOC) && defined(__cplusplus)
@@ skipping 126 matching lines @@
 #  define SK_GAMMA_EXPONENT (2.2f)
 #endif
 
 //////////////////////////////////////////////////////////////////////
 
 #ifndef GR_TEST_UTILS
 #  define GR_TEST_UTILS 1
 #endif
 
 #endif // SkPostConfig_DEFINED