message: Change boost download script + Fix OSS CI
  Summary: Boost download path has changed. Didn't do the cached boost thing because we don't run this script in SPARTA's circle CI config.
diff: # This source code is licensed under the MIT license found in the
  # LICENSE file in the root directory of this source tree.
  +BOOST_VERSION="1.71.0"
  +
  +BOOST_VERSION_UNDERSCORE="${BOOST_VERSION//./_}"
  +BOOST_FILE="boost_${BOOST_VERSION_UNDERSCORE}.tar.bz2"
  +BOOST_TAR_URL="https://boostorg.jfrog.io/artifactory/main/release/${BOOST_VERSION}/source/${BOOST_FILE}"
  +BOOST_DIR="boost_${BOOST_VERSION_UNDERSCORE}"
  +
  set -e
  -wget https://dl.bintray.com/boostorg/release/1.71.0/source/boost_1_71_0.tar.bz2
  -tar --bzip2 -xf boost_1_71_0.tar.bz2
  -cd boost_1_71_0
  +wget "$BOOST_TAR_URL" -O "$BOOST_FILE"
  +tar --bzip2 -xf "$BOOST_FILE"
  +cd "$BOOST_DIR"
  ./bootstrap.sh --with-libraries=thread
  ./b2 -d0 install
  