header include cleanup

- ensures alphabetical ordering for includes etc. in source file headers

src/sync.cpp

@@ -7,9 +7,10 @@
 #include "util.h"
 #include "utilstrencodings.h"
 
+#include <stdio.h>
+
 #include <boost/foreach.hpp>
 #include <boost/thread.hpp>
-#include <stdio.h>
 
 #ifdef DEBUG_LOCKCONTENTION
 void PrintLockContention(const char* pszName, const char* pszFile, int nLine)