Rename 'wc_root' wc private api function to the more common 'wcroot'.

No functional changes.

* subversion/include/private/svn_wc_private.h
  (svn_wc__get_wc_root): Rename this function to ...
  (svn_wc__get_wcroot): ... this.

* subversion/libsvn_client/commit.c
  (determine_lock_targets):

* subversion/libsvn_client/commit_util.c
  (bail_on_tree_conflicted_ancestor):

* subversion/libsvn_client/delete.c
  (svn_client_delete4):

* subversion/libsvn_client/diff.c
  (diff_repos_wc):

* subversion/libsvn_client/externals.c
  (switch_file_external):

* subversion/libsvn_client/info.c
  (svn_client_get_wc_root):
     Update callers.

* subversion/libsvn_wc/wcroot_anchor.c
  (svn_wc__get_wc_root): Rename this function to ...
  (svn_wc__get_wcroot): ... this.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1427830 13f79535-47bb-0310-9956-ffa450edef68