Restore __WARNINGS__ in NEW mail template.

templates/process-unchecked.new

@@ -9,6 +9,8 @@ Content-Type: text/plain; charset="utf-8"
 Content-Transfer-Encoding: 8bit
 Subject: __CHANGES_FILENAME__ is NEW
 
+__WARNINGS__
+
 Your package contains new components which requires manual editing of
 the override file.  It is ok otherwise, so please be patient.  New
 packages are usually added to the override file about once a week.