flush logs when printing to stdout

src/log/filelog.cpp

@@ -112,6 +112,7 @@ void FileLog::save_log(WTextStream * buffer)
 			if( log_stdout )
 			{
 				wide_stream_to_utf8(*buffer, std::cout);
+				std::cout.flush();
 			}
 
 			if( !log_file.empty() )