Fix infinite loop with LogPrint on Windows

Running -printtodebugger -debug (or -debug=lock),
compiled with -DDEBUG_LOCKORDER would infinite loop
on Windows because every critical section lock/unlock
triggers a LogPrint.

Solution is to use the raw boost mutex instead of a CCriticalSection.

src/util.cpp

@@ -299,13 +299,11 @@ int LogPrint(const char* category, const char* pszFormat, ...)
 #ifdef WIN32
     if (fPrintToDebugger)
     {
-        static CCriticalSection cs_OutputDebugStringF;
-
         // accumulate and output a line at a time
-        {
-            LOCK(cs_OutputDebugStringF);
         static std::string buffer;
 
+        boost::mutex::scoped_lock scoped_lock(*mutexDebugLog);
+
         va_list arg_ptr;
         va_start(arg_ptr, pszFormat);
         buffer += vstrprintf(pszFormat, arg_ptr);
@@ -320,7 +318,6 @@ int LogPrint(const char* category, const char* pszFormat, ...)
         }
         buffer.erase(0, line_start);
     }
-    }
 #endif
     return ret;
 }