message: no longer test 32bit macOS
diff: set -euo pipefail
  # Determine configuration
  -if [ "$TRAVIS_OS_NAME" == osx ]; then
  - FOREIGN_TARGET=i686-apple-darwin
  -else
  +if [ "$TRAVIS_OS_NAME" == linux ]; then
  FOREIGN_TARGET=i686-unknown-linux-gnu
  fi
  export CARGO_EXTRA_FLAGS="--all-features"
  @@ -28,6 +26,8 @@ echo "Test host architecture"
  run_tests
  echo
  +if [ -n "$FOREIGN_TARGET" ]; then
  echo "Test foreign architecture ($FOREIGN_TARGET)"
  MIRI_TEST_TARGET="$FOREIGN_TARGET" run_tests
  echo
  +fi
  