Remove include of stdlib.h from SkTypes.h.

tests/SortTest.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.
  */
 
 #include "SkRandom.h"
 #include "SkTSort.h"
 #include "Test.h"
 
+#include <stdlib.h>
+
 extern "C" {
     static int compare_int(const void* a, const void* b) {
         return *(const int*)a - *(const int*)b;
     }
 }
 
 static void rand_array(SkRandom& rand, int array[], int n) {
     for (int j = 0; j < n; j++) {
         array[j] = rand.nextS() & 0xFF;
     }
@@ skipping 31 matching lines @@
         SkTHeapSort<int>(workingArray, count);
         check_sort(reporter, "Heap", workingArray, sortedArray, count);
 
         memcpy(workingArray, randomArray, sizeof(randomArray));
         SkTQSort<int>(workingArray, workingArray + count - 1);
         check_sort(reporter, "Quick", workingArray, sortedArray, count);
     }
 }
 
 // need tests for SkStrSearch