Update Makefile, added missing librt reference on CentOS or another Linux OS (-lrt compile option).
Update Makefile, added missing librt reference on CentOS or another Linux OS (-lrt compile option).

Signed-off-by: shines77 <c816ee361b8bcaf7cf19d627e3bc89a63016b2b4@msn.com>

shines77/RingQueue-utf8,shines77/RingQueue-utf8,shines77/RingQueue-utf8,shines77/RingQueue-utf8