Steer user toward unar, a free RARv3 extractor in the repo.

As per @Legimet's suggestion.

helpers/make-unrar-free

@@ -22,10 +22,9 @@ VERSION=1
 . ./config
 
 # Trisquel Issue #7969 - package unrar suggests non-free software
-sed '/only the non-free "unrar" package can do that/s//see http\:\/\/www.fsf.org\/blogs\/licensing\/free-rarv3-extraction/
-/Conflicts: unrar-nonfree/d' -i debian/control
+sed '/only the non-free "unrar" package can do that/s//see package unar for that/;/Conflicts: unrar-nonfree/d' -i debian/control
 
-changelog "Compiled for Trisquel"
+changelog "FSDG Compliance #7969"
 
 compile