ra vtable do_merge function?

Hey,

In continuing to work on ra_pipe, I went to take a look at the do_merge
functions in ra_local and ra_dav, and found that there weren't any. Both ra's
just pass null as the vtable pointer, and no code in subversion ever calls
do_merge. Should prototype be removed from the vtable interface, or is there
a reason to keep it?

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Kevin Pilch-Bisson                    http://www.pilch-bisson.net
     "Historically speaking, the presences of wheels in Unix
     has never precluded their reinvention." - Larry Wall
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~