mbrestore doesn't restore highest-order 31st bit of flags correctly

mbrestore (1.6.5.4) would complain about things like...

OverflowError: can't convert negative number to unsigned long
Traceback (most recent call last):
File "/opt/membase/lib/python/mbrestore", line 73, in worker
update(str(k), exptime, socket.ntohl(flags), bytearray(v))

The socket.ntohl doesn't like flags that have the highest-order bit set, such as flags of 0x8000000 and higher.

Bin was pointing at some ctypes-related fix for this.