autoconf: Update.

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>
automake: Update to version 1.14.1.

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>
Update xz to version 5.0.5.

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>
Update libevent.

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>
Update libmemcached to version 1.0.18.

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>
Do not use parallel make when it is not safe.

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>
Update unrar to version 5.0.1

Signed-off-by: Rudá Moura <ruda.moura@gmail.com>