[PATCH] Updating exclusively opened files locks working copy

Are there any objections to this patch? It solves a problem where the
working copy ends up locked (requiring a 'svn cleanup') after an
update fails because a file being updated is exclusively opened by
another application.

Log:
Test early for other applications holding files open exclusively so
that we can prevent
a cleanup being required when the update would fail later in log processing.

* subversion/libsvn_wc/update_editor.c
  (add_or_open_file): Attempt to temporarily open the file being updated.

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