Add new timestamps_in_pdf_generated_by_libreoffice toolchain issue.

issues.yml

@@ -337,6 +337,10 @@ timestamps_in_pdf_generated_by_latex:
     ModDate set to the current date and time.
   url: https://wiki.debian.org/ReproducibleBuilds/TimestampsInPDFGeneratedByLaTeX
   deterministic: True
+timestamps_in_pdf_generated_by_libreoffice:
+  description: |
+    eg. libreoffice --headless --convert-to-pdf creates PDF files with
+    CreationDate field with the current date, encoded with the current timezone
 timestamps_in_documentation_generated_by_htmldoc:
   description: |
     PDF files generated with htmldoc will contain CreationDate set to the current