PR #1884: misc/loc: add unknown-files hint

Author: j-ogas

misc/loc

@@ -327,6 +327,7 @@ if [[ -s /tmp/loc.extra ]]; then
  cat /tmp/loc.extra
  echo
  echo '🚨🚨🚨 unknown files found 🚨🚨🚨'
+ echo 'hint: did you forget to add new file(s) to misc/loc?'
  exit 1
 fi