[CMake fixes] Linux X11 pixel format and Windows compilation fix

src/ports/SkOSEnvironment.cpp

 
 /*
  * Copyright 2015 Google Inc.

[Marco A., 2016/03/25 14:31:11]

As a sidenote, no idea why diff didn't work here. Newline formats perhaps?

[mtklein, 2016/03/25 15:16:10]

Yes, I think this happens when you upload from Windows.  The side-by-side diff
link works.

  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOSEnvironment.h"
+#include "SkTypes.h"
 #include <stdlib.h>
 
 void sk_setenv(const char* key, const char* value) {
 #ifdef SK_BUILD_FOR_WIN32
     _putenv_s(key, value);
 #else
     setenv(key, value, 1);
 #endif
 }