message: chore(ffi): update gen_header script to use unpretty option
diff: @@ -71,7 +71,7 @@ cp "$CAPI_DIR/include/hyper.h" "$header_file_backup"
  cd "${WORK_DIR}" || exit 2
  # Expand just the ffi module
  -if ! output=$(RUSTFLAGS='--cfg hyper_unstable_ffi' cargo rustc -- -Z unstable-options --pretty=expanded 2>&1 > expanded.rs); then
  +if ! output=$(RUSTFLAGS='--cfg hyper_unstable_ffi' cargo rustc -- -Z unpretty=expanded 2>&1 > expanded.rs); then
  # As of April 2021 the script above prints a lot of warnings/errors, and
  # exits with a nonzero return code, but hyper.h still gets generated.
  #
  