Memcached 1.5.7发布，修复64位ARM处理器对齐问题

Memcached 1.5.7 已发布，该版本没有新增的功能，主要是修复 bug。

修复了 64 位 ARM 处理器的对齐问题，seccomp 可移植性以及使用二进制触发命令时的 extstore 引发的 refcount 泄漏问题。具体如下：

• extstore: fix ref leak when using binary protocol with TOUCH,GAT,GATK

• Drop supplementary groups in addition to setgid

• Use HAVE_SASL_CB_GETCONFPATH

• Fix SASL_CB_GETCONF(PATH) detection

• Rewrite memchached-tool 'dump' method to use new lru_crawler interface.

• Fixes decrement-before-check problem (issue #362).

• document in manpage that port 0 is off.

• Fix SIGBUS from alignment issues on 64bit ARM

• Update seccomp with syscalls found on Arch

• Enforce seccomp policy (kill process)

• Support seccomp on musl

• update --help for UDP default

• Fix sed options order in rpm specfile

详细更新请查看发布说明：https://github.com/memcached/memcached/wiki/ReleaseNotes157  
源码下载：https://github.com/memcached/memcached/releases/tag/1.5.7