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

experimental/LightSymbolsUtil/lightsymbols/lightsymbols.h

 #ifndef __LIGHT_SYMBOLS__
 #define __LIGHT_SYMBOLS__
 #define LS_TRACE(functionName,fileId,lineNumber) LightSymbol __lstr(functionName,fileId,lineNumber);
 
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 
 //#include <pthread.h>
-#include <Windows.h>
+#include <windows.h>
 
 typedef char* SZ;
 
 #define LIGHT_SYMBOLS_FILE "LIGHT_SYMBOLS_FILE"
 
 class LightSymbol {
   const char* sym;
   int fileId;
   int lineNumber;
 
@@ skipping 20 matching lines @@
   bool GetCallStackCore(char* sz, int len, const char* separator) const ;
 
   static LightSymbol* GetCurrentFrame() ;
 
   static void SetCurrentFrame(LightSymbol* ls) ;
 
   static const char* trim(char* sz) ;
 };
 
 #endif