[PATCH] [W32] Use SSIZE_T for ssize_t on Windows instead of long

[NIIBE Yutaka]

Werner Koch wrote:
> Other opinions? 

I think that it's consisitent to use SSIZE_T.  It's better to change.

On the other hand, we know that MSVC compiles some code differently
(than developers expect).  I have experiences to examine constant-time
intended code compiled by MSVC, using godbolt.org.  I wonder (and am not
sure) if our libgcrypt is OK when building with MSVC.
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