No deduplication on %doc

[mcepl]

It is too common to include a folder of documentation in %doc statement in %files. Unfortunately, there is no deduplication there (and when not using %install there is not even a possibility of doing deduplication explicitly), so we get rpmlint warnings like:

[   36s] python311-abimap-doc.noarch: W: files-duplicate /usr/share/doc/packages/python311-abimap-doc/html/_static/fonts/RobotoSlab/roboto-slab-v7-bold.woff /usr/share/doc/packages/python311-abimap-doc/html/_stat
ic/css/fonts/Roboto-Slab-Bold.woff

and these are completely correct ones and sometimes quite substantial in size (images, fonts).

We need to investigate, whether there is something we could do about this.