message: exclude third party code from coverage
diff: @@ -33,6 +33,7 @@ if ${COVERAGE:-false}; then
  "$project_dir"'/examples/*' \
  "$project_dir"'/tools/*' \
  "$project_dir"'/tests/*' \
  + "$project_dir"'/src/*xxh*' \
  "$project_dir"'/src/*hash*' \
  "$project_dir"'/src/powers.h' \
  --output-file coverage.info || ferr "failed lcov"
  