Support Writing OS-specific Code - Compiler Programming Ep182

Added a way to check inside a function which OS it is being compiled to. Together with a guarantee that `if`s on static condition are also static this gives a nice alternative to C ifdefs. If you like this video, consider supporting me on Patreon: https://www.patreon.com/dmitriy_kubyshkin GitHub: https://github.com/grassator/mass Twitter: https://twitter.com/d_kubyshkin Blog: https://kubyshkin.name