Clean out Python 2.6 leftovers from splice.py
Clean out Python 2.6 leftovers from splice.py

ctypes.ssize_t exists since Python 2.7 (not just the fuzzy 2.7.X, but
CPython tag "v2.7"), so we don't need to define our own.

Change-Id: Ib3c9b162ceffabd78622ae51c5accc4b7ba1294d

tipabu/swift,openstack/swift,swiftstack/swift,swiftstack/swift,swiftstack/swift,openstack/swift,tipabu/swift,tipabu/swift,tipabu/swift,openstack/swift,openstack/swift