[win32] Don't try to read out windows version
[win32] Don't try to read out windows version

The value isn't used anywhere

Change-Id: I3eed0e70dbe5ee1ecc378c7d6fd7f58667147c7d
Reviewed-on: https://review.couchbase.org/c/sigar/+/167784
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Jim Walker <1cd02e31b43620d7c664e038ca42a060d61727b9@couchbase.com>

couchbase/sigar,couchbase/sigar