Fix archive_wincrypt_version compilation

Fix archive_wincrypt_version compilation

Cast address of "version" to BYTE pointer for CryptGetProvParam.
Fix "major" variable assignment for picky compilers like MSVC.

The "length" variable is an in/out variable. It must be set to the size
of available memory within "version". Right now it is undefined behavior
and 0 would crash during runtime.

Fixes https://github.com/libarchive/libarchive/issues/2628

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>