D7903: sha1dc: avoid including the nonexistent stdint.h with Visual Studio 2008

[Yuya Nishihara]

>  #ifndef SHA1DC_NO_STANDARD_INCLUDES
> +#if !defined(_MSC_VER) || _MSC_VER >= 1600
>  #include <stdint.h>
> +#else
> +/* prior to Visual Studio 2010 */
> +typedef unsigned int uint32_t;

`unsigned __int32` for consistency.