[server] configure: Check for libssl to fix linkage error.

Since librabbitmq uses SSL, we need explicitly check for libssl.

Signed-off-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@miraclelinux.com>
[server] AMQPConsumer: Disable SSL support without libssl.

Signed-off-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@miraclelinux.com>
spec: Requires openssl.

Signed-off-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@miraclelinux.com>