Do not bind to same interface more than once.
Do not bind to same interface more than once.

Before 6ba9aa2771adcf785fe3fde03cd71832db15b086, multiple -l arguments
were ignored, and the last option passed was the one actually used.

This changes the behaviour to silently ignore duplicate -l flag options
passed and not crash and burn on the bind() call.

memcached/memcached,guikcd/memcached,elfchief/memcached,rmccullagh/memcached,rmccullagh/memcached,bpzhang/memcached,rmccullagh/memcached,bpzhang/memcached,rmccullagh/memcached,memcached/memcached,elfchief/memcached,guikcd/memcached,samanbarghi/memcached,rmccullagh/memcached,dormando/memcached,gencer/memcached,samanbarghi/memcached,elfchief/memcached,elfchief/memcached,guikcd/memcached,dormando/memcached,elfchief/memcached,guikcd/memcached,gencer/memcached,samanbarghi/memcached,bpzhang/memcached,dormando/memcached,dormando/memcached,gencer/memcached,memcached/memcached,gencer/memcached,samanbarghi/memcached,dormando/memcached,bpzhang/memcached,memcached/memcached,guikcd/memcached,gencer/memcached,memcached/memcached