Make sure the crawling for local svn:externals changes also finds changes to existing svn:externals properties.
Make sure the crawling for local svn:externals changes also finds changes
to existing svn:externals properties.

* subversion/libsvn_client/externals.c
  (svn_client__gather_local_external_changes): Add all local svn:externals
    changes. Not just the ones that didn't exist yet.

Found by: steveking

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