msvcr90: Implement fread_s. (try 2)

[Kusanagi Kouichi]

On 2011-12-23 12:41:56 +0100, Piotr Caban wrote:
> This is still not working good. I don't know how it should be
> implemented without doing much more testing. Probably printing a
> FIXME message and returning an error will be acceptable.
> 
> If you want to fully implement it I guess it should do something like this:
>  - execute _filbuf (this is probably causing the one character
> position change you're observing)
>  - analyze internal FILE buffer and return error if needed
>  - do the read
> There are some problems if more data should be read then can be
> stored in internal FILE  buffer.

I don't want to fully implement fread_s. It is suffice for me to call
fread without paramater validation. I'd like to send reduced version
if it is acceptable.