Ubuntu 14.10 compile error
```
vis@LTSP:~/xmrig-proxy$ LANG=C sudo make
[  2%] Building CXX object CMakeFiles/xmrig-proxy.dir/src/api/Api.cpp.o
In file included from /home/vis/xmrig-proxy/src/api/ApiState.h:28:0,
                 from /home/vis/xmrig-proxy/src/api/Api.cpp:28:
/home/vis/xmrig-proxy/src/proxy/StatsData.h:87:22: error: function definition does not declare parameters
/home/vis/xmrig-proxy/src/proxy/StatsData.h:88:30: error: function definition does not declare parameters
make[2]: *** [CMakeFiles/xmrig-proxy.dir/src/api/Api.cpp.o] Error 1
make[1]: *** [CMakeFiles/xmrig-proxy.dir/all] Error 2
```