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

@@ -299,27 +299,24 @@ int LogPrint(const char* category, const char* pszFormat, ...)
 #ifdef WIN32
     if (fPrintToDebugger)
     {
-        static CCriticalSection cs_OutputDebugStringF;
-
         // accumulate and output a line at a time
+        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);
+        va_end(arg_ptr);
+
+        int line_start = 0, line_end;
+        while((line_end = buffer.find('\n', line_start)) != -1)
         {
-            LOCK(cs_OutputDebugStringF);
+            OutputDebugStringA(buffer.substr(line_start, line_end - line_start).c_str());
-            static std::string buffer;
+            line_start = line_end + 1;
-
+            ret += line_end-line_start;
-            va_list arg_ptr;
-            va_start(arg_ptr, pszFormat);
-            buffer += vstrprintf(pszFormat, arg_ptr);
-            va_end(arg_ptr);
-
-            int line_start = 0, line_end;
-            while((line_end = buffer.find('\n', line_start)) != -1)
-            {
-                OutputDebugStringA(buffer.substr(line_start, line_end - line_start).c_str());
-                line_start = line_end + 1;
-                ret += line_end-line_start;
-            }
-            buffer.erase(0, line_start);
         }
+        buffer.erase(0, line_start);
     }
 #endif
     return ret;