Ev2 shims: Explicitly error on the shim callbacks which are not yet implemented.
Ev2 shims: Explicitly error on the shim callbacks which are not yet implemented.

* subversion/libsvn_delta/compat.c
  (alter_symlink_cb, move_cb, rotate_cb): Use SVN__NOT_IMPLEMENTED().

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion