message: Fix `find protobuf_archive` command for macos
  The original command doesn't work for macos because regex behaves differently.
  Fixes
diff: @@ -125,7 +125,7 @@ function prepare_src() {
  mkdir -p ${TMPDIR}/google
  mkdir -p ${TMPDIR}/third_party
  pushd ${RUNFILES%org_tensorflow} > /dev/null
  - for header in $(find protobuf_archive -regex ".*\.\(h\|inc\)"); do
  + for header in $(find protobuf_archive -type f,l \( -name "*.h" -o -name "*.inc" \)); do
  mkdir -p "${TMPDIR}/google/$(dirname ${header})"
  cp "$header" "${TMPDIR}/google/$(dirname ${header})/"
  done
  