Fix compile error.

python/msgpack/pack.h

@@ -15,18 +15,6 @@
  *    See the License for the specific language governing permissions and
  *    limitations under the License.
  */
-#if _MSC_VER
-typedef signed char uint8_t;
-typedef unsigned char uint8_t;
-typedef short int16_t;
-typedef unsigned short uint16_t;
-typedef int int32_t;
-typedef unsigned int uint32_t;
-typedef long long int64_t;
-typedef unsigned long long uint64_t;
-#else
-#include <stdint.h>
-#endif
 
 #include <stddef.h>
 #include <stdlib.h>