msvcrt: Add support for sprintf_s

[André Hentschel]

Chris Robinson schrieb:
> This doesn't seem correct to me. According to MSDN, sprintf_s checks for valid 
> formatting chars (in addition to the buffer and format arguments) and invokes 
> an invalid parameter handler if something bad turns up. It then returns -1 
> with errno set to EINVAL if execution is allowed to continue. Additionally, if 
> the buffer is too small to hold the resulting string, it is made an empty 
> string and invokes the invalid parameter handler. It also guarantees the 
> output buffer is null terminated.
> 
> http://msdn.microsoft.com/en-us/library/ce3zzk1k(VS.80).aspx
> 
> 

Looks like some further testing is needed, we can not depend on msdn.

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Best Regards, André Hentschel