mal4s: fix build failure

``brew install mal4s`` failed with messages:

~~~text
src/gource_settings.cpp:1461:14: error: no member named 'cin' in namespace 'std'
        std::cin.clear();
        ~~~~~^
3 errors generated.
~~~

A patch has been already submitted to upstream (https://github.com/secure411dotorg/mal4s/pull/38), and merged to its HEAD.

This PR is a back port for version 1.1.2.