windows: fix building of c_shard_info.pyx

without this, that `c_shard_info.c` fails to compile like the following:

```
  cassandra\c_shard_info.c(3083): error C2065: '__uint128_t': undeclared identifier
  cassandra\c_shard_info.c(3083): error C2146: syntax error: missing ')' before identifier '__pyx_v_biased_token'
  cassandra\c_shard_info.c(3083): error C2059: syntax error: ')'
  cassandra\c_shard_info.c(3083): error C2059: syntax error: ')'
  cassandra\c_shard_info.c(3083): error C2059: syntax error: ')'
```

Author: fruch

cassandra/c_shard_info.pyx

@@ -15,6 +15,15 @@
 from libc.stdint cimport INT64_MIN, UINT32_MAX, uint64_t, int64_t
 
 cdef extern from *:
+    """
+    #include <stdint.h>
+
+    // windows doesn't have __uint128_t, do we need to define ourself
+    #if defined(_WIN32) || defined(MS_WINDOWS) || defined(_MSC_VER)
+        #define __uint128_t unsigned long long
+    #endif
+
+    """
     ctypedef unsigned int __uint128_t
 
 cdef class ShardingInfo():