Updated configure.ac to correct openssl/libevent setup.
Updated configure.ac to correct openssl/libevent setup.

Fixes a problem introduced by configure.ac reordering in commit 4df2b62.

Review: https://reviews.apache.org/r/71138/

kaysoky/mesos,reneploetz/mesos,chhsia0/mesos,dforsyth/mesos,Gilbert88/mesos,reneploetz/mesos,abudnik/mesos,chhsia0/mesos,Gilbert88/mesos,reneploetz/mesos,dforsyth/mesos,chhsia0/mesos,kaysoky/mesos,kaysoky/mesos,kaysoky/mesos,abudnik/mesos,reneploetz/mesos,Gilbert88/mesos,kaysoky/mesos,Gilbert88/mesos,chhsia0/mesos,dforsyth/mesos,chhsia0/mesos,dforsyth/mesos,abudnik/mesos,kaysoky/mesos,reneploetz/mesos,abudnik/mesos,abudnik/mesos,abudnik/mesos,kaysoky/mesos,dforsyth/mesos,reneploetz/mesos,reneploetz/mesos,Gilbert88/mesos,dforsyth/mesos,abudnik/mesos,dforsyth/mesos,chhsia0/mesos,chhsia0/mesos,Gilbert88/mesos,Gilbert88/mesos