Silence VS 2010 warning on loss of precision (_int64 -> _int32).

This is safe because the actual value is already range-checked.

Modules/_lzmamodule.c

@@ -160,7 +160,7 @@ grow_buffer(PyObject **buf)
                             "Value too large for " #TYPE " type"); \
             return 0; \
         } \
-        *(TYPE *)ptr = val; \
+        *(TYPE *)ptr = (TYPE)val; \
         return 1; \
     }