[PATCH] dir_delta content check

Revised patch with cmpilato's comments and additional md5 check.

Avoid dir_delta from calling apply_textdelta that is actually noop
with ignore_ancestry is on. This makes many things work better in the
case of two mutually merged branches, since editors now know the
source and target stream are the same without having to construct the
fulltext from the noop txdelta. svn diff the two branches will no
longer show a lot of empty diffs.

* libsvn_repos/delta.c
  (compare_files): New.
  (delta_files): Use compare_files instead of svn_fs_contents_changed
  with ignore_ancestry is on.

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