Not referencing them caused them to be missing from the source packages.
This also moves all files that were in different dirs under the common
additional-files dir.
* Referring the current haiku version explicitly is not needed, since
the RequiresUpdater takes care of setting the version of Haiku used
for building a package.
* this fixes the wrong recipe names introduced by myself in #d525fee
* adjust patch names to match corresponding recipes
* additionally: create 'additional-files' folders as hint to some
ports that do not have a proper recipe yet