Update, add class keyword to solve build issue for Bison 2.7 on OSX.
Update, add class keyword to solve build issue for Bison 2.7 on OSX.


Distrotech/libmemcached,Distrotech/libmemcached,bigbes/libmemcached,bigbes/libmemcached,Distrotech/libmemcached,bigbes/libmemcached