[PATCH] Replace two deprecated wc functions

Hi!

NOTE: This patch depends on my patch for #3390 that has not been
commited yet [1]. The external_func uses abspaths and that is fixed in
the referred patch. I have two more patches that depend on [1].

make check passes with [1] applied.

[[[
Replace deprecated svn_wc_{crawl_revisions4(),get_update_editor3()}.
Remove svn_wc_edited_externals().

* subversion/libsvn_client/update.c
  (svn_client__update_internal): Use the new get_update_editor4() with
    wc_ctx and external_func. Use the new crawl_revisions5() with
    wc_ctx and external_func. Remove svn_wc_edited_externals() since we
    already have the hashtables from our external_func.

Patch by: <daniel{_AT_}longitudo.com>
]]]

[1] http://svn.haxx.se/dev/archive-2009-12/0286.shtml