libmemcached v1.0.18

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
libmemcached: add 1.0.18 bottle.

Closes #26998.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
libmemcached: add upstream patch submission URL.
jruby: 1.7.11
jruby: add 1.7.11 bottle.