message: run-swig.sh makes use of build-utils env variables
diff: #!/bin/bash
  +# NOTE: Run this script manually every time you make changes to libtorrent.i, this is not ran by any of the build scripts, including .travis.yml
  +source build-utils.shinc
  +
  +abort_if_var_unset "LIBTORRENT_ROOT" LIBTORRENT_ROOT
  +abort_if_var_unset "BOOST_ROOT" BOOST_ROOT
  +abort_if_var_unset "JLIBTORRENT_VERSION" JLIBTORRENT_VERSION
  function fixCode() {
  sed -i '' 's/) &;/) ;/g' ${LIBTORRENT_ROOT}/include/libtorrent/file_storage.hpp
  