Macro std::sys::windows::compat::compat_fn_with_fallback

macro_rules! compat_fn_with_fallback {
    (pub static $module:ident: &CStr = $name:expr; $(
        $(#[$meta:meta])*
        $vis:vis fn $symbol:ident($($argname:ident: $argtype:ty),*) -> $rettype:ty $fallback_body:block
    )*) => { ... };
}

Load a function or use a fallback implementation if that fails.