I'd do this if the patched file still used TeX syntax. Alas, LibreOffice
does not understand the TeX command \patterns{ } so I had to get rid of
it, hence it's no longer a TeX file. Also I don't see any point of
storing the effective file (especially with no description in it) in the
docs directory. Perhaps I'm mistaking some details of Debian packaging
policy, but I still prefer the override_dh_auto_install approach here.