Backport of r1551579

Hi,

r1551579 is nominated for 1.7.X backport by rhuijben, with a backport branch.

I wanted to test said branch to make my (non-binding) vote for this issue, and it seems that the backport branch needs another fix added:

In r1427830, the function svn_wc__get_wc_root was renamed to svn_wc__get_wcroot:
http://svn.apache.org/viewvc?view=revision&revision=1427830

The backported code still uses the new name, so it did not build in my tests.

I propose the attached patch for the the 1.7.x-r1551579 branch:
 
Proposed commit message:
---
Revert the calls of the renamed svn_wc__get_wcroot back to svn_wc__get_wc_root,
so the fix compiles against SVN 1.7. (The function was renamed in r1427830.)

* subversion/libsvn_client/copy.c
  (do_wc_to_wc_moves): Fixed function name to svn_wc__get_wc_root.

Approved by: <NN>
---

Due to my partial committer status, I can commit it myself after getting approved by a dev. :-)

Best regards

Markus Schaber

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