message: Fix typo in eosio_build_centos.sh
diff: cd ${HOME}/opt
  STATUS=$(curl -LO -w '%{http_code}' --connect-timeout 30 https://cmake.org/files/v3.10/cmake-3.10.2.tar.gz)
  if [ "${STATUS}" -ne 200 ]; then
  - printf "\tUnable to download Boost libraries at this time.\n"
  + printf "\tUnable to download CMAKE at this time.\n"
  printf "\tExiting now.\n\n"
  exit;
  fi
  