Processed: add forwarded address

[Debian Bug Tracking System]

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> forwarded 943451 https://github.com/doxygen/doxygen/issues/7609
Bug #943451 [src:ppl] libppl-doc: FTBFS with doxygen 1.8.16-1~exp3 from experimental
Set Bug forwarded-to-address to 'https://github.com/doxygen/doxygen/issues/7609'.
> thanks
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943451: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=943451
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