include: add msasn1.h

[Charles Davis]

> On Feb 5, 2015, at 1:20 PM, Austin English <austinenglish at gmail.com> wrote:
> +typedef unsigned long ASN1uint32_t;
> +typedef signed long ASN1int32_t;
This won’t do what you (apparently) expect on 64-bit. At the very least, you should use ULONG/DWORD and LONG here.

> +#ifndef WINAPI
> +#define WINAPI __stdcall
> +#endif
This is most certainly wrong for Wine. I think you should include “windef.h” if you need WINAPI.

I’m beginning to wonder if you copied this header (as well as <hidpi.h>) directly from Microsoft’s SDKs. You’ve been around long enough to know that that’s a big no-no around here.

Chip