Perl's Cache::Memcached did not like the negative flag coming out of memcached.

It caused reads to time out, then return undef for anything set by erlmc. While this is arguably a bug in Cache::Memcached as modern memcaches can indeed use all 32 bits, it also seems like a good idea to simply not emit flags that some clients can't use properly, and which are not used by erlmc at all.