Remove config.h

sky/engine/wtf/StringExtras.h

 /*
  * Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef SKY_ENGINE_WTF_STRINGEXTRAS_H_
 #define SKY_ENGINE_WTF_STRINGEXTRAS_H_
 
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
 #include <strings.h>
+#include "sky/engine/wtf/OperatingSystem.h"
 
 #if !HAVE(STRNSTR)
 
 inline char* strnstr(const char* buffer, const char* target, size_t bufferLength)
 {
     size_t targetLength = strlen(target);
     if (targetLength == 0)
         return const_cast<char*>(buffer);
     for (const char* start = buffer; *start && start + targetLength <= buffer + bufferLength; start++) {
         if (*start == *target && strncmp(start + 1, target + 1, targetLength - 1) == 0)
             return const_cast<char*>(start);
     }
     return 0;
 }
 
 #endif
 
 #endif  // SKY_ENGINE_WTF_STRINGEXTRAS_H_