Remove use of `__MonoCS__`. In mono 5 with `csc` the define isn't available anymore ( http://www.mono-project.com/docs/about-mono/releases/5.0.0/#c-compiler )
Remove use of `__MonoCS__`. In mono 5 with `csc` the define isn't
available anymore (
http://www.mono-project.com/docs/about-mono/releases/5.0.0/#c-compiler )

This probably breaks the Windows build.

symbooglix/symbooglix,symbooglix/symbooglix,symbooglix/symbooglix