[Mono-dev] Fix shadow copy and define UNICODE on windows

[Aras Pranckevicius]

> Sorry, reattached ChangeLog with reason (snprintf doesn't exist on Win32 (VS
> build); also for uniformity as we use g_snprintf everywhere else) and added
> signoff. If you would rather me do something else than use g_snprintf please
> let me know.

There is _snprintf on VS. What we do in our codebase is just a #define
for those, and use snprintf.

-- 
Aras Pranckevicius
Graphics programmer at unity3d.com