Don't override $DLDFLAGS
Don't override $DLDFLAGS

Fixes #22.

songling88/zookeeper,songling88/zookeeper,rickypai/zookeeper,rickypai/zookeeper,songling88/zookeeper,zk-ruby/zookeeper,songling88/zookeeper,rickypai/zookeeper,rickypai/zookeeper,zk-ruby/zookeeper,zk-ruby/zookeeper